As the Law emphasizes the knowledge of God and His creation by inference...

As the Law emphasizes the knowledge of God and His creation by inference, it is incumbent on any who wish to know God and His whole creation by inference, to learn the kinds of inference, their conditions and that which distinguishes philosophy from dialectic and exhortation from syllogism. This is impossible unless one possesses knowledge beforehand of the various kinds of reasoning and learns to distinguish between reasoning and what is not reasoning.

This cannot be done except one knows its different parts, that is, the different kinds of premises. Hence, for a believer in the Law and a follower of it, it is necessary to know these things before he begins to look into creation, for they are like instruments for observation.

For, just as a student discovers by the study of the law, the necessity of knowledge of legal reasoning with all its kinds and distinctions, a student will find out by observing the creation the necessity of metaphysical reasoning. Indeed, he has a greater claim on it than the jurist.

For if a jurist argues the necessity of legal reasoning from the saying of God: "Wherefore take example from them O you who have eyes" [Qur'an 59.2], a student of divinity has a better right to establish the same from it on behalf of metaphysical reasoning. One cannot maintain that this kind of reasoning is an innovation in religion because it did not exist in the early days of Islam.

For legal reasoning and its kinds are things which were invented also in later ages, and no one thinks they are innovations. Such should also be our attitude towards philosophical reasoning. There is another reason why it should be so, but this is not the proper place to mention it. A large number of the followers of this religion confirm philosophical reasoning, all except a small worthless minority, who argue from religious ordinances.

Now, as it is established that the Law makes the consideration of philosophical reasoning and its kinds as necessary as legal reasoning, if none of our predecessors has made an effort to enquire into it, we should begin to do it, and so help them, until the knowledge is complete.

For if it is difficult or rather impossible for one person to acquaint himself single-handed with all things which it is necessary to know in legal matters, it is still more difficult in the case of philosophical reasoning. And, if before us, somebody has enquired into it, we should derive help from what he has said.