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  • AlGhazalisIhya-Book_of_knowledge, page : 75

Chapter Three

On what is popularly considered to be a part of the science of religion, but
is (really) not

Including a discussion of the circumstances under, which some of the sciences
would be blameworthy; and on the exposition of how the names of certain
sciences, jurisprudence, the science of religion, theology, admonition, and
philosophy, have been changed, as well as on showing how much of sacred
knowledge is praiseworthy and how much is blameworthy.

Be advised then that knowledge is not held to be blameworthy in itself. It is only
regarded as such in the eyes of men for one of three reasons.

First when it leads to any harm, whether the harm should befall its practitioner or
someone else besides, for, which reason the science of magic and talismans is
held blameworthy.

Second, a knowledge is blameworthy when it is mostly (fi ghalib al-amr) harmful