Surah 41. Fussilat, Ayah 36

I.e., He alone sees what is in the hearts of men, and He alone understands the innermost motivations, of which they themselves are unconscious, of those who criticize the Qur'an adversely. - See {7:199-200} and the corresponding notes, especially note [164].

Nazaga has in it the idea of discord, slander, disharmony, as well as incitements to such disturbances in the soul. They can only proceed from evil, and should be resisted with the help of Allah. See also last note.