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39 2 MZ77Za7?ZSa Philosophy [CH. making the presumption that he is outside the house, for he might also be dead. But I know that Devadatta was living and also that he was not at home; this perception of his absence from home creates a doubt as regards my first knowledge that he is living, and it is for the removal of this doubt that there creeps in the presumption that he must be living somewhere else. The perception of the absence of Devadatta through the intermediate link of a doubt passes into the notion of a presumption that he must then remain somewhere else. In inference there is no ele- ment of doubt, for it is only when the smoke is perceived to exist beyond the least element of doubt that the inference of the fire is possible, but in presumption the perceived non-existence in the house leads to the presumption of an external existence only when it has thrown the fact of the man's being alive into doubt and uncertaintyl. Kumarila however objects to this explanation of Prabhakara, and says that if the fact that Devadatta is living is made doubt- ful by the absence of Devadatta at his house, then the doubt may as well be removed by the supposition that Devadatta is dead, for it does not follow that the doubt with regard to the life of Devadatta should necessarily be resolved by the supposition of his being outside the house. Doubt can only be removed when the cause or the root of doubt is removed, and it does not follow that because Devadatta is not in the house therefore he is living. If it was already known that Devadatta was living and his absence from the house creates the doubt, how then can the very fact which created the doubt remove the doubt? The cause of doubt cannot be the cause of its removal too. The real procedure of the presumption is quite the other way. The doubt about the life of Devadatta being removed by previous knowledge or by some other means, we may presume that he must be outside the house when he is found absent from the house. So there can- not be any doubt about the life of Devadatta. It is the certainty of his life associated with the perception of his absence from the house that leads us to the presumption of his external existence. There is an opposition between the life of Devadatta and his absence from the house, and the mind cannot come to rest without the presumption of his external existence. The mind oscillates between two contradictory poles both of which it accepts but 1 See Prakararapancikii, pp. 113- 11 5.