He who practices Tasawwuf without learning Sacred Law corrupts his faith, while he who learns Sacred Law without practicing Tasawwuf corrupts himself. Only he who combines the two proves true.

Knowledge is not to be taken from four types of people: a foolish person who openly acts foolish, even if he reports the most narrations an adherent of bid'ah who calls to his desires a person who lies, even if I don't accuse him of lying in hadith and a righteous pious worshiper who does not accurately retain what he narrates.