and is not found in the nature of things. For instance, if we say that it is possible that it will rain or not, then the possibility is found in the nature of things, that is, it is felt that a thing may sometimes be, and at others not be, as in the case of rain. Here, reason can exactly decide the possibility of a thing by its nature. The necessary (wajib) is quite contrary to it; that is, it is a thing the existence of which is always found. In this case reason can always decide without a mistake, because its nature cannot be changed or transformed. So when one party admits the existence of a prophet, at a certain time it appears that the prophetic mission is a thing whose existence is possible and the other party says that it cannot feel it, then that possibility becomes mere ignorance in its case. Now we believe in the existence of this possibility because we have known the prophets. We say that a knowledge of the messengers from man, leads us to a belief in the existence of
