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  • AlGhazalisIhya-Book_of_knowledge, page : 63

The first: This includes geometry and arithmetic, both of, which are, as has
already been said, permissible and no one is barred from them except the person
who might be held by their study to blameworthy sciences, for most of those who
practice them have stepped over to innovations. Thus the weak are barred from
the study of geometry and arithmetic just as the boy is barred from the bank of
the river lest he should fall into the water, and as the newly converted Muslim is
kept away from company of unbelievers for fear he might be influenced by them.
In this last case not even the strong is called upon to mix with the unbelievers.

The second: This is logic, which is the study of the nature of evidence and its
conditions as well as the nature of a definition and its conditions. Both of these
are included under theology.

The third: This is Divinity, which is the science of the begin and attributes of
Allah. This is also included under theology.

Furthermore, the philosophers have not, in their philosophy, developed another
type of science, but have branched out into several schools, of, which some are