It is unfortunate for us that the doctrine of reincarnation met with almost universal assent in India[429]. If some one were to found a new Christian sect, he would probably not be asked to prove the immortality of the soul: it is assumed as part of the common religious belief. Similarly, no one asked the Buddha to prove the doctrine of rebirth. If we permit our fancy to picture an interview between him and someone holding the ordinary ideas of an educated European about the soul, we may imagine that he would have some difficulty in understanding what is the alternative to rebirth. His interlocutor might reply that there are two types of theory among Europeans. Some think that the soul comes into existence with the body at birth but continues to exist everlasting and immortal after the death of the body. Others, commonly called materialists, while agreeing that the soul comes into existence with the birth of the body, hold that it ceases to exist with the death of the body. To the first theory the Buddha would probably have replied that there is one law without exception, namely that whatever has a beginning has also an end. The whole universe offers no analogy or parallel to the soul which has a beginning but no end, and not the smallest logical need is shown for believing a doctrine so contrary to the nature of things. And as for materialism he would probably say that it is a statement of the processes of the world as perceived but no explanation of the mental or even of the physical world. The materialists forget that objects as known cannot be isolated from the knowing subject. Sensation implies contact and duality but it is no real explanation to say that mental phenomena are caused by physical phenomena. The Buddha reckoned among vain speculations not only such problems as the eternity and infinity of the world but also the question, Is the principle of life (Jîva) identical with the body or not identical. That question, he said, is not properly put, which is tantamount to condemning as inadequate all theories which derive life and thought from purely material antecedents[430]. Other ideas of modern Europe, such as that the body is an instrument on which the soul works, or the expression of the soul, seem to imply, or at least to be compatible with, the pre-existence of the soul.
It is probable too that the Buddha would have said, and a modern Buddhist would certainly say, that the fact of rebirth can easily be proved by testimony and experience, because those who will make the effort can recall their previous births. For his hearers the difficulty must have been not to explain why they believed in rebirth but to harmonize the belief with the rest of the master's system, for what is reborn and how? We detect a tendency to say that it is Viññâṇa, or consciousness, and the expression paṭisandhiviññâṇam or rebirth-consciousness occurs[431]. The question is treated in an important dialogue in the Majjhima-Nikâya[432], where a monk called Sâti maintains that, according to the Buddha's teaching, consciousness transmigrates unchanged. The Buddha summoned Sâti and rebuked his error in language of unusual severity, for it was evidently capital and fatal if persisted in. The Buddha does not state what transmigrates, as the European reader would wish him to do, and would no doubt have replied to that question that it is improperly framed and does not admit of an answer.
His argument is directed not so much against the idea that consciousness in one existence can have some connection with consciousness in the next, as against the idea that this consciousness is a unity and permanent. He maintains that it is a complex process due to many causes, each producing its own effect. Yet the Pitakas seem to admit that the processes which constitute consciousness in one life, can also produce their effect in another life, for the character of future lives may be determined by the wishes which we form in this life. Existence is really a succession of states of consciousness following one another irrespective of bodies. If ABC and abc are two successive lives, ABC is not more of a reality or unity than BCa. No personality passes over at death from ABC to abc but then ABC is itself not a unity: it is merely a continuous process of change[433].
The discourse seems to say that taṇhâ, the thirst for life, is the connecting link between different births, but it does not use this expression. In one part of his address the Buddha exhorts his disciples not to enquire what they were or what they will be or what is the nature of their present existence, but rather to master and think out for themselves the universal law of causation, that every state has a cause for coming into being and a cause for passing away. No doubt his main object is as usual practical, to incite to self-control rather than to speculation. But may he not also have been under the influence of the idea that time is merely a form of human thought? For the ordinary mind which cannot conceive of events except as following one another in time, the succession of births is as true as everything else. The higher kinds of knowledge, such as are repeatedly indicated in the Buddha's discourse, though they are not described because language is incapable of describing them, may not be bound in this way by the idea of time and may see that the essential truth is not so much a series of births in which something persists and passes from existence to existence, as the timeless fact that life depends upon taṇhâ, the desire for life. Death, that is the breaking up of such constituents of human life as the body, states of consciousness, etc., does not affect taṇhâ. If taṇhâ has not been deliberately suppressed, it collects skandhas again. The result is called a new individual. But the essential truth is the persistence of the taṇhâ until it is destroyed.
Still there is no doubt that the earliest Buddhist texts and the discourse ascribed to the Buddha himself speak, when using ordinary untechnical language, of rebirth and of a man dying and being born[434] in such and such a state. Only we must not suppose that the man's self is continued or transferred in this operation. There is no entity that can be called soul and strictly speaking no entity that can be called body, only a variable aggregation of skandhas, constantly changing. At death this collocation disperses but a new one reassembles under the influence of taṇhâ, the desire of life, and by the law of karma which prescribes that every act must have its result. The illustration that comes most naturally is that of water. Waves pass across the surface of the sea and successive waves are not the same, nor is what we call the same wave really the same at two different points in its progress, and yet one wave causes another wave and transmits its form and movement. So are beings travelling through the world (saṃsâra) not the same at any two points in a single life and still less the same in two consecutive lives: yet it is the impetus and form of the previous lives, the desire that urges them and the form that it takes, which determine the character of the succeeding lives.
But Buddhist writers more commonly illustrate rebirth by fire than by water and this simile is used with others in the Questions of Milinda. We cannot assume that this book reflects the views of the Buddha or his immediate followers, but it is the work of an Indian in touch with good tradition who lived a few centuries later and expressed his opinions with lucidity. It denies the existence of transmigration and of the soul and then proceeds to illustrate by metaphors and analogies how two successive lives can be the same and yet not the same. For instance, suppose a man carelessly allows his lamp to set his thatch on fire with the result that a whole village is burnt down. He is held responsible for the loss but when brought before the judge argues that the flame of his lamp was not the same as the flame that burnt down the village. Will such a plea be allowed? Certainly not. Or to take another metaphor. Suppose a man were to choose a young girl in marriage and after making a contract with her parents were to go away, waiting for her to grow up. Meanwhile another man comes and marries her. If the two men appeal to the King and the later suitor says to the earlier, The little child whom you chose and paid for is one and the full grown girl whom I paid for and married is another, no one would listen to his argument, for clearly the young woman has grown out of the girl and in ordinary language they are the same person. Or again suppose that one man left a jar of milk with another and the milk turned to curds. Would it be reasonable for the first man to accuse the second of theft because the milk has disappeared?
The caterpillar and butterfly might supply another illustration. It is unfortunate that the higher intelligences offer no example of such metamorphosis in which consciousness is apparently interrupted between the two stages. Would an intelligent caterpillar take an interest in his future welfare as a butterfly and stigmatize as vices indulgences pleasant to his caterpillar senses and harmful only to the coming butterfly, between whom and the caterpillar there is perhaps no continuity of consciousness? We can imagine how strongly butterflies would insist that the foundation of morality is that caterpillars should realize that the butterflies' interests and their