messengers from God, as the existence of a messenger from Anir, leads us to the conclusion of there being a messenger from Zaid also. This requires a similarity in the natural dispositions of both men and it is here where the difficulty lies. If we suppose this possibility by itself even in the future, it will only be by the means of the known fact and not by our knowledge and reason. Now one of the premises of this possibility has come into existence. For the possibility is in our knowledge, and the fact in itself is an established one, by one of the two alternatives, that is, whether he sent a messenger or did not. So we have nothing in this case but sheer ignorance, as is the doubt whether Anir sent any messengers in the past or did not, which is quite different from our doubting, whether or not he will send any in future. So when we do not know about Zaid, for instance, whether he has or has not sent any messenger in the past, it is not correct for us to suppose
