who said:

“Allah sets forth a parable: a straight path, with two walls along its sides. In the walls are open doors, and over the doors hang lowered curtains. A caller calls at the entrance to the path, and another caller calls from above it. The straight path is Islam, the curtains are the limits set by Allah, and the open doors are the things Allah has forbidden. Whenever a servant wishes to open one of those doors, the caller calls out to him—or words to that effect—‘O servant of Allah, do not open it, for if you open it, you will enter it.’ The caller at the entrance to the path is the Book of Allah, and the caller above the path is Allah’s admonisher in the heart of every believer.”

He thus made clear that within the heart of every believer there is an admonisher. Admonition consists of commanding and forbidding through encouragement and warning. These commands and prohibitions that arise in the believer’s heart accord with the commands and prohibitions of the Quran; thus, each strengthens the other.

As Allah Most High says:

“Light upon light.”

Some of the early Muslims said concerning this verse: “It refers to the believer who speaks with wisdom even though he has heard no transmitted report concerning it. Then, when he hears such a report, it becomes light upon light.” The light of faith in his heart accords with the light of the Quran, just as the rational balance accords with the revealed Book. For Allah sent down the Book and the balance so that people might uphold justice. A servant may be granted one of the two without being granted the other.

Thus, the two Sahīh collections relate from Abū Mūsā al-Ashʿarī that the Prophet, may Allah bless him and grant him peace, said:

“The believer who recites the Quran is like a citron: its taste is pleasant and its fragrance is pleasant. And the likeness of