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A Comprehensive Manual of Abhidhamma
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A Comprehensive Manual of Abhidhamma
The Abhidhammattha Sangaha of Acariya Anuruddha
general editor
Bhikkhu Bodhi
pali text originally edited and translated by
Mahathera Narada
© 1995


by U Rewata Dhamma and Bhikkhu Bodhi

The nucleus of the present book is a medieval compendium of Buddhist philosophy entitled the Abhidhammattha Sangaha. This work is ascribed to Acariya Anuruddha, a Buddhist savant about whom so little is known that even his country of origin and the exact century in which he lived remain in question. Nevertheless, despite the personal obscurity that surrounds the author, his little manual has become one of the most important and influential textbooks of Theravada Buddhism. In nine short chapters occupying about fifty pages in print, the author provides a masterly summary of that abstruse body of Buddhist doctrine called the Abhidhamma. Such is his skill in capturing the essentials of that system, and in arranging them in a format suitable for easy comprehension, that his work has become the standard primer for Abhidhamma studies throughout the Theravada Buddhist countries of South and Southeast Asia. In these countries, particularly in Burma where the study of Abhidhamma is pursued most assiduously, the Abhidhammattha Sangaha is regarded as the indispensable key to unlock this great treasure-store of Buddhist wisdom.

The Abhidhamma

At the heart of the Abhidhamma philosophy is the Abhidhamma Pitaka, one of the divisions of the Pali canon recognized by Theravada Buddhism as the authoritative recension of the Buddha’s teachings. This canon was compiled at the three great Buddhist councils held in India in the early centuries following the Buddha’s demise: the first, at Rajagaha, convened three months after the Buddha’s Parinibbana by five hundred senior monks under the leadership of the Elder Mahakassapa; the second, at Vesali, a hundred years later; and the third, at Pataliputta, two hundred years later. The canon that emerged from these councils, preserved in the Middle Indian language now called Pali, is known as the Tipitaka, the three "baskets" or collections of the teachings. The first collection, the Vinaya Pitaka, is the book of discipline, containing the rules of conduct for the bhikkhus and bhikkhunis — the monks and nuns — and the regulations governing the Sangha, the monastic order. The Sutta Pitaka, the second collection, brings together the Buddha’s discourses spoken by him on various occasions during his active ministry of forty-five years. And the third collection is the Abhidhamma Pitaka, the "basket" of the Buddha’s "higher" or "special" doctrine.

This third great division of the Pali canon bears a distinctly different character from the other two divisions. Whereas the Suttas and Vinaya serve an obvious practical purpose, namely, to proclaim a clear-cut message of deliverance and to lay down a method of personal training, the Abhidhamma Pitaka presents the appearance of an abstract and highly technical systemization of the doctrine. The collection consists of seven books: the Dhammasangani, the Vibhanga, the Dhatukatha, the Puggalapaññatti, the Kathavatthu, the Yamaka, and the Patthana. Unlike the Suttas, these are not records of discourses and discussions occurring in real-life settings; they are, rather, full-blown treatises in which the principles of the doctrine have been methodically organized, minutely defined, and meticulously tabulated and classified. Though they were no doubt originally composed and transmitted orally and only written down later, with the rest of the canon in the first century B.C., they exhibit the qualities of structured thought and rigorous consistency more typical of written documents.

In the Theravada tradition the Abhidhamma Pitaka is held in the highest esteem, revered as the crown jewel of the Buddhist scriptures. As examples of this high regard, in Sri Lanka King Kassapa V (tenth century A.C.) had the whole Abhidhamma Pitaka inscribed on gold plates and the first book set in gems, while another king, Vijayabahu (eleventh century) used to study the Dhammasangani each morning before taking up his royal duties and composed a translation of it into Sinhala. On a cursory reading, however, this veneration given to the Abhidhamma seems difficult to understand. The texts appear to be merely a scholastic exercise in manipulating sets of doctrinal terms, ponderous and tediously repetitive.

The reason the Abhidhamma Pitaka is so deeply revered only becomes clear as a result of thorough study and profound reflection, undertaken in the conviction that these ancient books have something significant to communicate. When one approaches the Abhidhamma treatises in such a spirit and gains some insight into their wide implications and organic unity, one will find that they are attempting nothing less than to articulate a comprehensive vision of the totality of experienced reality, a vision marked by extensiveness of range, systematic completeness, and analytical precision. From the standpoint of Theravada orthodoxy the system that they expound is not a figment of speculative thought, not a mosaic put together out of metaphysical hypotheses, but a disclosure of the true nature of existence as apprehended by a mind that has penetrated the totality of things both in depth and in the finest detail. Because it bears this character, the Theravada tradition regards the Abhidhamma as the most perfect expression possible of the Buddha’s unimpeded omniscient knowledge (sabbaññuta-ñana). It is his statement of the way things appear to the mind of a Fully Enlightened One, ordered in accordance with the two poles of his teaching: suffering and the cessation of suffering.

The system that the Abhidhamma Pitaka articulates is simultaneously a philosophy, a psychology, and an ethics, all integrated into the framework of a program for liberation. The Abhidhamma may be described as a philosophy because it proposes an ontology, a perspective on the nature of the real. This perspective has been designated the "dhamma theory" (dhammavada). Briefly, the dhamma theory maintains that ultimate reality consists of a multiplicity of elementary constituents called dhammas. The dhammas are not noumena hidden behind phenomena, not "things in themselves" as opposed to "mere appearances," but the fundamental components of actuality. The dhammas fall into two broad classes: the unconditioned dhamma, which is solely Nibbana, and the conditioned dhammas, which are the momentary mental and material phenomena that constitute the process of experience. The familiar world of substantial objects and enduring persons is, according to the dhamma theory, a conceptual construct fashioned by the mind out of the raw data provided by the dhammas. The entities of our everyday frame of reference possess merely a consensual reality derivative upon the foundational stratum of the dhammas. It is the dhammas alone that possess ultimate reality: determinate existence "from their own side" (sarupato) independent of the mind’s conceptual processing of the data.

Such a conception of the nature of the real seems to be already implicit in the Sutta Pitaka, particularly in the Buddha’s disquisitions on the aggregates, sense bases, elements, dependent arising, etc., but it remains there tacitly in the background as the underpinning to the more pragmatically formulated teachings of the Suttas. Even in the Abhidhamma Pitaka itself the dhamma theory is not yet expressed as an explicit philosophical tenet; this comes only later, in the Commentaries. Nevertheless, though as yet implicit, the theory still comes into focus in its role as the regulating principle behind the Abhidhamma’s more evident task, the project of systemization.

This project starts from the premise that to attain the wisdom that knows things "as they really are," a sharp wedge must be driven between those types of entities that possess ontological ultimacy, that is, the dhammas, and those types of entities that exist only as conceptual constructs but are mistakenly grasped as ultimately real. Proceeding from this distinction, the Abhidhamma posits a fixed number of dhammas as the building blocks of actuality, most of which are drawn from the Suttas. It then sets out to define all the doctrinal terms used in the Suttas in ways that reveal their identity with the ontological ultimates recognized by the system. On the basis of these definitions, it exhaustively classifies the dhammas into a net of pre-determined categories and modes of relatedness which highlight their place within the system’s structure. And since the system is held to be a true reflection of actuality, this means that the classification pinpoints the place of each dhamma within the overall structure of actuality.

The Abhidhamma’s attempt to comprehend the nature of reality, contrary to that of classical science in the West, does not proceed from the standpoint of a neutral observer looking outwards towards the external world. The primary concern of the Abhidhamma is to understand the nature of experience, and thus the reality on which it focuses is conscious reality, the world as given in experience, comprising both knowledge and the known in the widest sense. For this reason the philosophical enterprise of the Abhidhamma shades off into a phenomenological psychology. To facilitate the understanding of experienced reality, the Abhidhamma embarks upon an elaborate analysis of the mind as it presents itself to introspective meditation. It classifies consciousness into a variety of types, specifies the factors and functions of each type, correlates them with their objects and physiological bases, and shows how the different types of consciousness link up with each other and with material phenomena to constitute the ongoing process of experience.

This analysis of mind is not motivated by theoretical curiosity but by the overriding practical aim of the Buddha’s teaching, the attainment of deliverance from suffering. Since the Buddha traces suffering to our tainted attitudes — a mental orientation rooted in greed, hatred, and delusion — the Abhidhamma’s phenomenological psychology also takes on the character of a psychological ethics, understanding the term "ethics" not in the narrow sense of a code of morality but as a complete guide to noble living and mental purification. Accordingly we find that the Abhidhamma distinguishes states of mind principally on the basis of ethical criteria: the wholesome and the unwholesome, the beautiful factors and the defilements. Its schematization of consciousness follows a hierarchical plan that corresponds to the successive stages of purity to which the Buddhist disciple attains by practice of the Buddha’s path. This plan traces the refinement of the mind through the progression of meditative absorptions, the fine-material-sphere and immaterial-sphere jhanas, then through the stages of insight and the wisdom of the supramundane paths and fruits. Finally, it shows the whole scale of ethical development to culminate in the perfection of purity attained with the mind’s irreversible emancipation from all defilements.

All three dimensions of the Abhidhamma — the philosophical, the psychological, and the ethical — derive their final justification from the cornerstone of the Buddha’s teaching, the program of liberation announced by the Four Noble Truths. The ontological survey of dhammas stems from the Buddha’s injunction that the noble truth of suffering, identified with the world of conditioned phenomena as a whole, must be fully understood (pariññeyya). The prominence of mental defilements and requisites of enlightenment in its schemes of categories, indicative of its psychological and ethical concerns, connects the Abhidhamma to the second and fourth noble truths, the origin of suffering and the way leading to its end. And the entire taxonomy of dhammas elaborated by the system reaches its consummation in the "unconditioned element" (asankhata dhatu), which is Nibbana, the third noble truth, that of the cessation of suffering.

The Twofold Method

The great Buddhist commentator, Acariya Buddhaghosa, explains the word "Abhidhamma" as meaning "that which exceeds and is distinguished from the Dhamma" (dhammatireka-dhammavisesa), the prefix abhi having the sense of preponderance and distinction, and dhamma here signifying the teaching of the Sutta Pitaka.[1] When the Abhidhamma is said to surpass the teaching of the Suttas, this is not intended to suggest that the Suttanta teaching is defective in any degree or that the Abhidhamma proclaims some new revelation of esoteric doctrine unknown to the Suttas. Both the Suttas and the Abhidhamma are grounded upon the Buddha’s unique doctrine of the Four Noble Truths, and all the principles essential to the attainment of enlightenment are already expounded in the Sutta Pitaka. The difference between the two in no way concerns fundamentals but is, rather, partly a matter of scope and partly a matter of method.

As to scope, the Abhidhamma offers a thoroughness and completeness of treatment that cannot be found in the Sutta Pitaka. Acariya Buddhaghosa explains that in the Suttas such doctrinal categories as the five aggregates, the twelve sense bases, the eighteen elements, and so forth, are classified only partly, while in the Abhidhamma Pitaka they are classified fully according to different schemes of classification, some common to the Suttas, others unique to the Abhidhamma.[2] Thus the Abhidhamma has a scope and an intricacy of detail that set it apart from the Sutta Pitaka.

The other major area of difference concerns method. The discourses contained in the Sutta Pitaka were expounded by the Buddha under diverse circumstances to listeners with very different capacities for comprehension. They are primarily pedagogical in intent, set forth in the way that will be most effective in guiding the listener in the practice of the teaching and in arriving at a penetration of its truth. To achieve this end the Buddha freely employs the didactic means required to make the doctrine intelligible to his listeners. He uses simile and metaphor; he exhorts, advises, and inspires; he sizes up the inclinations and aptitudes of his audience and adjusts the presentation of the teaching so that it will awaken a positive response. For this reason the Suttanta method of teaching is described as pariyaya-dhammadesana, the figurative or embellished discourse on the Dhamma.

In contrast to the Suttas, the Abhidhamma Pitaka is intended to divulge as starkly and directly as possible the totalistic system that underlies the Suttanta expositions and upon which the individual discourses draw. The Abhidhamma takes no account of the personal inclinations and cognitive capacities of the listeners; it makes no concessions to particular pragmatic requirements. It reveals the architectonics of actuality in an abstract, formalistic manner utterly devoid of literary embellishments and pedagogical expedients. Thus the Abhidhamma method is described as the nippariyaya-dhammadesana, the literal or unembellished discourse on the Dhamma.

This difference in technique between the two methods also influences their respective terminologies. In the Suttas the Buddha regularly makes use of conventional language (voharavacana) and accepts conventional truth (sammutisacca), truth expressed in terms of entities that do not possess ontological ultimacy but can still be legitimately referred to them. Thus in the Suttas the Buddha speaks of "I" and "you," of "man" and "woman," of living beings, persons, and even self as though they were concrete realities. The Abhidhamma method of exposition, however, rigorously restricts itself to terms that are valid from the standpoint of ultimate truth (paramatthasacca): dhammas, their characteristics, their functions, and their relations. Thus in the Abhidhamma all such conceptual entities provisionally accepted in the Suttas for purposes of meaningful communication are resolved into their ontological ultimates, into bare mental and material phenomena that are impermanent, conditioned, and dependently arisen, empty of any abiding self or substance.

But a qualification is necessary. When a distinction is drawn between the two methods, this should be understood to be based on what is most characteristic of each Pitaka and should not be interpreted as an absolute dichotomy. To some degree the two methods overlap and interpenetrate. Thus in the Sutta Pitaka we find discourses that employ the strictly philosophical terminology of aggregates, sense bases, elements, etc., and thus come within the bounds of the Abhidhamma method. Again, within the Abhidhamma Pitaka we find sections, even a whole book (the Puggalapaññatti), that depart from the rigorous manner of expression and employ conventional terminology, thus coming within the range of the Suttanta method.

Distinctive Features of the Abhidhamma

Apart from its strict adherence to the philosophical method of exposition, the Abhidhamma makes a number of other noteworthy contributions integral to its task of systemization. One is the employment, in the main books of the Abhidhamma Pitaka, of a matika — a matrix or schedule of categories — as the blueprint for the entire edifice. This matrix, which comes at the very beginning of the Dhammasangani as a preface to the Abhidhamma Pitaka proper, consists of 122 modes of classification special to the Abhidhamma method. Of these, twenty-two are triads (tika), sets of three terms into which the fundamental dhammas are to be distributed; the remaining hundred are dyads (duka), sets of two terms used as a basis for classification.[3] The matrix serves as a kind of grid for sorting out the complex manifold of experience in accordance with principles determined by the purposes of the Dhamma. For example, the triads include such sets as states that are wholesome, unwholesome, indeterminate; states associated with pleasant feeling, painful feeling, neutral feeling; states that are kamma results, productive of kamma results, neither; and so forth. The dyads include such sets as states that are roots, not roots; states concomitant with roots, not so concomitant; states that are conditioned, unconditioned; states that are mundane, supramundane; and so forth. By means of its selection of categories, the matrix embraces the totality of phenomena, illuminating it from a variety of angles philosophical, psychological, and ethical in nature.

A second distinguishing feature of the Abhidhamma is the dissection of the apparently continuous stream of consciousness into a succession of discrete evanescent cognitive events called cittas, each a complex unity involving consciousness itself, as the basic awareness of an object, and a constellation of mental factors (cetasika) exercising more specialized tasks in the act of cognition. Such a view of consciousness, at least in outline, can readily be derived from the Sutta Pitaka’s analysis of experience into the five aggregates, among which the four mental aggregates are always inseparably conjoined, but the conception remains there merely suggestive. In the Abhidhamma Pitaka the suggestion is not simply picked up, but is expanded into an extraordinarily detailed and coherent picture of the functioning of consciousness both in its microscopic immediacy and in its extended continuity from life to life.

A third contribution arises from the urge to establish order among the welter of technical terms making up the currency of Buddhist discourse. In defining each of the dhammas, the Abhidhamma texts collate long lists of synonyms drawn mostly from the Suttas. This method of definition shows how a single dhamma may enter under different names into different sets of categories. For example, among the defilements, the mental factor of greed (lobha) may be found as the taint of sensual desire, the taint of (attachment to) existence, the bodily knot of covetousness, clinging to sensual pleasures, the hindrance of sensual desire, etc.; among the requisites of enlightenment, the mental factor of wisdom (pañña) may be found as the faculty and power of wisdom, the enlightenment factor of investigation of states, the path factor of right view, etc. In establishing these correspondences, the Abhidhamma helps to exhibit the interconnections between doctrinal terms that might not be apparent from the Suttas themselves. In the process it also provides a precision-made tool for interpreting the Buddha’s discourses.

The Abhidhamma conception of consciousness further results in a new primary scheme for classifying the ultimate constituents of existence, a scheme which eventually, in the later Abhidhamma literature, takes precedence over the schemes inherited from the Suttas such as the aggregates, sense bases, and elements. In the Abhidhamma Pitaka the latter categories still loom large, but the view of mind as consisting of momentary concurrences of consciousness and its concomitants leads to a fourfold method of classification more congenial to the system. This is the division of actuality into the four ultimate realities (paramattha): consciousness, mental factors, material phenomena, and Nibbana (citta, cetasika, rupa, nibbana), the first three comprising conditioned reality and the last the unconditioned element.

The last novel feature of the Abhidhamma method to be noted here — contributed by the final book of the Pitaka, the Patthana — is a set of twenty-four conditional relations laid down for the purpose of showing how the ultimate realities are welded into orderly processes. This scheme of conditions supplies the necessary complement to the analytical approach that dominates the earlier books of the Abhidhamma. The method of analysis proceeds by dissecting apparent wholes into their component parts, thereby exposing their voidness of any indivisible core that might qualify as self or substance. The synthetic method plots the conditional relations of the bare phenomena obtained by analysis to show that they are not isolated self-contained units but nodes in a vast multi-layered web of inter-related, inter-dependent events. Taken in conjunction, the analytical method of the earlier treatises of the Abhidhamma Pitaka and the synthetic method of the Patthana establish the essential unity of the twin philosophical principles of Buddhism, non-self or egolessness (anatta) and dependent arising or conditionality (paticca samuppada). Thus the foundation of the Abhidhamma methodology remains in perfect harmony with the insights that lie at the heart of the entire Dhamma.

The Origins of the Abhidhamma

Although modern critical scholarship attempts to explain the formation of the Abhidhamma by a gradual evolutionary process,[4] Theravada orthodoxy assigns its genesis to the Buddha himself. According to the Great Commentary (maha-atthakatha) quoted by Acariya Buddhaghosa, "What is known as Abhidhamma is not the province nor the sphere of a disciple; it is the province, the sphere of the Buddhas."[5] The commentarial tradition holds, moreover, that it was not merely the spirit of the Abhidhamma, but the letter as well, that was already realized and expounded by the Buddha during his lifetime.

The Atthasalini relates that in the fourth week after the Enlightenment, while the Blessed One was still dwelling in the vicinity of the Bodhi Tree, he sat in a jewel house (ratanaghara) in the northwest direction. This jewel house was not literally a house made of precious stones, but was the place where he contemplated the seven books of the Abhidhamma Pitaka. He contemplated their contents in turn, beginning with the Dhammasangani, but while investigating the first six books his body did not emit rays. However, upon coming to the Patthana, when "he began to contemplate the twenty-four universal conditional relations of root, object, and so on, his omniscience certainly found its opportunity therein. For as the great fish Timiratipingala finds room only in the great ocean 84,000 yojanas in depth, so his omniscience truly finds room only in the Great Book. Rays of six colors — indigo, golden, red, white, tawny, and dazzling — issued from the Teacher’s body, as he was contemplating the subtle and abstruse Dhamma by his omniscience which had found such opportunity."[6]

Theravada orthodoxy thus maintains that the Abhidhamma Pitaka is authentic Word of the Buddha, in this respect differing from an early rival school, the Sarvastivadins. This school also had an Abhidhamma Pitaka consisting of seven books, considerably different in detail from the Theravada treatises. According to the Sarvastivadins, the books of the Abhidhamma Pitaka were composed by Buddhist disciples, several being attributed to authors who appeared generations after the Buddha. The Theravada school, however, holds that the Blessed One himself expounded the books of the Abhidhamma, except for the detailed refutation of deviant views in the Kathavatthu, which was the work of the Elder Moggaliputta Tissa during the reign of Emperor Asoka.

The Pali Commentaries, apparently drawing upon an old oral tradition, maintain that the Buddha expounded the Abhidhamma, not in the human world to his human disciples, but to the assembly of devas or gods in the Tavatimsa heaven. According to this tradition, just prior to his seventh annual rains retreat the Blessed One ascended to the Tavatimsa heaven and there, seated on the Pandukambala stone at the foot of the Paricchattaka tree, for the three months of the rains he taught the Abhidhamma to the devas who had assembled from the ten thousand world-systems. He made the chief recipient of the teaching his mother, Mahamaya-devi, who had been reborn as a deva. The reason the Buddha taught the Abhidhamma in the deva world rather than in the human realm, it is said, is because in order to give a complete picture of the Abhidhamma it has to be expounded from the beginning to the end to the same audience in a single session. Since the full exposition of the Abhidhamma requires three months, only devas and Brahmas could receive it in unbroken continuity, for they alone are capable of remaining in one posture for such a length of time.

However, each day, to sustain his body, the Buddha would descend to the human world to go on almsround in the northern region of Uttarakuru. After collecting almsfood he went to the shore of Anotatta Lake to partake of his meal. The Elder Sariputta, the General of the Dhamma, would meet the Buddha there and receive a synopsis of the teaching given that day in the deva world: "Then to him the Teacher gave the method, saying, ’Sariputta, so much doctrine has been shown.’ Thus the giving of the method was to the chief disciple, who was endowed with analytical knowledge, as though the Buddha stood on the edge of the shore and pointed out the ocean with his open hand. To the Elder also the doctrine taught by the Blessed One in hundreds and thousands of methods became very clear."[7]

Having learned the Dhamma taught him by the Blessed One, Sariputta in turn taught it to his own circle of 500 pupils, and thus the textual recension of the Abhidhamma Pitaka was established. To the Venerable Sariputta is ascribed the textual order of the Abhidhamma treatises as well as the numerical series in the Patthana. Perhaps we should see in these admissions of the Atthasalini an implicit acknowledgement that while the philosophical vision of the Abhidhamma and its basic architecture originate from the Buddha, the actual working out of the details, and perhaps even the prototypes of the texts themselves, are to be ascribed to the illustrious Chief Disciple and his entourage of students. In other early Buddhist schools, too, the Abhidhamma is closely connected with the Venerable Sariputta, who in some traditions is regarded as the literal author of Abhidhamma treatises.[8]

The Seven Books

A brief outline of the contents of the seven canonical Abhidhamma books will provide some insight into the plethora of textual material to be condensed and summarized by the Abhidhammattha Sangaha. The first book, the Dhammasangani, is the fountainhead of the entire system. The title may be translated "Enumeration of Phenomena," and the work does in fact undertake to compile an exhaustive catalog of the ultimate constituents of existence.

Opening with the matika, the schedule of categories which serves as the framework for the whole Abhidhamma, the text proper is divided into four chapters. The first, "States of Consciousness," takes up about half of the book and unfolds as an analysis of the first triad in the matika, that of the wholesome, the unwholesome, and the indeterminate. To supply that analysis, the text enumerates 121 types of consciousness classified by way of their ethical quality.[9] Each type of consciousness is in turn dissected into its concomitant mental factors, which are individually defined in full. The second chapter, "On Matter," continues the inquiry into the ethically indeterminate by enumerating and classifying the different types of material phenomena. The third chapter, called "The Summary," offers concise explanations of all the terms in the Abhidhamma matrix and the Suttanta matrix as well. Finally, a concluding "Synopsis" provides a more condensed explanation of the Abhidhamma matrix but omits the Suttanta matrix.

The Vibhanga, the "Book of Analysis," consists of eighteen chapters, each a self-contained dissertation, dealing in turn with the following: aggregates, sense bases, elements, truths, faculties, dependent arising, foundations of mindfulness, supreme efforts, means to accomplishment, factors of enlightenment, the eightfold path, jhanas, illimitables, training rules, analytical knowledges, kinds of knowledge, minor points (a numerical inventory of defilements), and "the heart of the doctrine" (dhammahadaya), a psycho-cosmic topography of the Buddhist universe. Most of the chapters in the Vibhanga, though not all, involve three sub-sections: an analysis according to the methodology of the Suttas; an analysis according to the methodology of the Abhidhamma proper; and an interrogation section, which applies the categories of the matrix to the subject under investigation.

The Dhatukatha, the "Discourse on Elements," is written entirely in catechism form. It discusses all phenomena with reference to the three schemata of aggregates, sense bases, and elements, seeking to determine whether, and to what extent, they are included or not included in them, and whether they are associated with them or dissociated from them.

The Puggalapaññatti, "Concepts of Individuals," is the one book of the Abhidhamma Pitaka that is more akin to the method of the Suttas than to the Abhidhamma proper. The work begins with a general enumeration of types of concepts, and this suggests that it was originally intended as a supplement to the other books in order to take account of the conceptual realities excluded by the strict application of the