If dhikr represents both the function of the prophets and the proper human response to the prophets, guidance (huda) represents the divine attribute … - William Chittick

The Koran commonly refers to the knowledge brought by the prophets as “remembrance” (dhikr) and “reminder” (dhikra, tadhkir), terms that derive from the root dh-k-r. The Koran calls itself by these words more than forty times, and it refers to other prophetic messages, like the Torah and the Gospel, by the same words. The basic Koranic understanding of the necessity for a plurality of prophets is that Adam’s children kept on falling into heedlessness and forgetfulness, which is the shortcoming of their father. The only cure for this shortcoming is the remembrance that God provides by means of the prophets.

To lose the ability to see with the eye of tawhid means to fall into seeing with the eye of shirk, or associating other gods with God. If the Qur’an considers unrepented shirk the one unforgivable sin, this is no doubt because it entails an utter distortion of human understanding, a corruption of the human fitra, and an obscuration of the intelligence that is innate to every human being.

To be human is to be born with the fitra, which is an innate recognition of tawhid that is represented mythically by the Covenant of Alast and the Trust. There is nothing extraneous or superadded about this fitra—it is precisely what makes people human. But the fitra tends to become obscured by upbringing and circumstances, and then people become less than human. They are "deaf, dumb, blind—like the cattle; no, even further astray." Dhikr is the all-important remedy that makes possible the actualization of the fitra. Dhikr is both God's merciful response to heedlessness, and the human response to God's mercy.