A-4.7: Knowledge of the Heart

As for knowledge o the heart, meaning familiarity with the illness of the heart such as envy, pride, and the like (dis:book p.r. and s). Ghazali has said that knowledge of their definitions, causes, remedy, and treatment is personally obligatory. (A: And this is what Ghazali meant when he said that Sufism (Tasawwuf, dis:w-9) is personally obligatory for every Muslim. He did not mean that taking a way (tariqa) and sheikh are obligatory, but rather the elimination of unlawful inner traits, which one could conceivably accomplish through the companionship of a single sincere brother.)

Others hold that if the morally responsible individual is endowed with a heart free of all these unlawful diseases, it suffices him, and he is not obliged to learn what will cure them. But if not safe from them he must reflect: if he can purify his heart from them without instruction then he must purify it, just as he must shun fornication and the like without learning the evidence proving he must. But if he cannot rid himself of these unlawful traits except through learning the above mentioned knowledge, then he is personally obliged to. And Allah knows best (al-Majmu' (y 108), 1.24-26).