Again we can have a glimpse of the respective positions of the Vâtsiputtrîyas and the Sarvâstivâdins as represented by Vasubandhu if we attend to the discussion on the subject of the existence of soul in Abhidharmakos'a. The argument of Vasubandhu against the existence of soul is this, that though it is true that the sense organs may be regarded as a determining cause of perception, no such cause can be found which may render the inference of the existence of soul necessary. If soul actually exists, it must have an essence of its own and must be something different from the elements or entities of a personal life. Moreover, such an eternal, uncaused and unchanging being would be without any practical efficiency (arthakriyâkâritva) which alone determines or proves existence. The soul can thus be said to have a mere nominal existence as a mere object of current usage. There is no soul, but there are only the elements of a personal life. But the Vâtsiputtrîya school held that just as fire could not be said to be either the same as the burning wood or as different from it, and yet it is separate from it, so the soul is an individual (pudgala) which has a separate existence, though we could not say that it was altogether different from the elements of a personal life or the same as these. It exists as being conditioned by the elements of personal life, but it cannot further be defined. But its existence cannot be denied, for wherever there is an activity, there must be an agent (e.g. Devadatta walks). To be conscious is likewise an action, hence the agent who is conscious must also exist. To this Vasubandhu replies that Devadatta (the name of a person) does not represent an unity. "It is only an unbroken continuity of momentary forces (flashing into existence), which simple people believe to be a unity and to which they give the name Devadatta. Their belief that Devadatta moves is conditioned, and is based on an analogy with their own experience, but their own continuity of life consists in constantly moving from one place to another. This movement, though regarded as
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[Footnote 1: I am indebted for the above account to the unpublished translation from Tibetan of a small portion of Abhidharmakoia by my esteemed friend Prof. Th. Stcherbatsky of Petrograd. I am grateful to him that he allowed me to utilize it.]
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belonging to a permanent entity, is but a series of new productions in different places, just as the expressions 'fire moves,' 'sound spreads' have the meaning of continuities (of new productions in new places). They likewise use the words 'Devadatta cognises' in order to express the fact that a cognition (takes place in the present moment) which has a cause (in the former moments, these former moments coming in close succession being called Devadatta)."
The problem of memory also does not bring any difficulty, for the stream of consciousness being one throughout, it produces its recollections when connected with a previous knowledge of the remembered object under certain conditions of attention, etc., and absence of distractive factors, such as bodily pains or violent emotions. No agent is required in the phenomena of memory. The cause of recollection is a suitable state of mind and nothing else. When the Buddha told his birth stories saying that he was such and such in such and such a life, he only meant that his past and his present belonged to one and the same lineage of momentary existences. Just as when we say "this same fire which had been consuming that has reached this object," we know that the fire is not identical at any two moments, but yet we overlook the difference and say that it is the same fire. Again, what we call an individual can only be known by descriptions such as "this venerable man, having this name, of such a caste, of such a family, of such an age, eating such food, finding pleasure or displeasure in such things, of such an age, the man who after a life of such length, will pass away having reached an age." Only so much description can be understood, but we have never a direct acquaintance with the individual; all that is perceived are the momentary elements of sensations, images, feelings, etc., and these happening at the former moments exert a pressure on the later ones. The individual is thus only a fiction, a mere nominal existence, a mere thing of description and not of acquaintance; it cannot be grasped either by the senses or by the action of pure intellect. This becomes evident when we judge it by analogies from other fields. Thus whenever we use any common noun, e.g. milk, we sometimes falsely think that there is such an entity as milk, but what really exists is only certain momentary colours, tastes, etc., fictitiously unified as milk; and "just as milk and water are
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conventional names (for a set of independent elements) for some colour, smell (taste and touch) taken together, so is the designation 'individual' but a common name for the different elements of which it is composed."
The reason why the Buddha declined to decide the question whether the "living being is identical with the body or not" is just because there did not exist any living being as "individual," as is generally supposed. He did not declare that the living being did not exist, because in that case the questioner would have thought that the continuity of the elements of a life was also denied. In truth the "living being" is only a conventional name for a set of constantly changing elements [Footnote ref 1].
The only book of the Sammitîyas known to us and that by name only is the Sammitîyas'âstra translated into Chinese between 350 A.D. to 431 A.D.; the original Sanskrit works are however probably lost [Footnote ref 2].