To master this instrument the religious thinker must make a preliminary study of logic, just as the lawyer must study legal reasoning. This is no more heretical in the one case than in the other. And logic must be learned from the ancient masters, regardless of the fact that they were not Muslims.
In: Jon McGinnis, David C. Reisman (2007) Classical Arabic Philosophy: An Anthology of Sources. p. 310. - The Decisive Treatise