Surah 41. Fussilat, Ayah 4

The "people of [innate] knowledge" mentioned in the preceding verse are obviously those who understand the spiritual purport of this divine writ and, therefore, submit to its guidance: hence, it cannot be "most of them" who are referred to in the above phrase and in the next verse, but, on the contrary, people who are devoid of such knowledge and to whom, in consequence, the Qur'an is meaningless. This elliptically implied differentation - overlooked by almost all of the commentators (with perhaps the sole exception of Ibn Kathir) - can only be brought out by means of an interpolation at the beginning of the sentence.

With all the qualities mentioned in the last note, if men do not profit by its blessings, the fault lies in their will: they turn away, and thus fail to hear the voice that calls to them.