Do you not see that He, Exalted is He, said:
‘Did We not grant you lives long enough for whoever would reflect to do so? And the warner came to you.’
He thus based His case against them on the length of life granted for thought and recollection, and then on reflection intended to awaken them.”
I say:
Those who hold that reason makes knowledge of Allah obligatory, and that such knowledge can be attained only through reason, have stated that the messengers explained the rational proofs used by those engaged in inquiry, just as they awakened the heedless and reinforced the case against them. For they were no less capable than someone who learns arithmetic, medicine, astronomy, and jurisprudence from books—not by blindly following their authors’ statements, but because those authors’ explanations point him to proofs that he can examine through his own reason.
Allah’s guidance of His servants through the Books He has revealed, and His direction of them to illuminating proofs and paths leading to knowledge, along which the inquirer exercises his reason to attain that knowledge, are greater than the words of any speaker. For the best speech is Allah’s speech, and the best guidance is the guidance of Muhammad, may Allah bless him and grant him peace.
Abū al-Khattāb adopts the position held by many—or most—of the Hanafīs, together with those scholastic theologians among the Mu‘tazilah and others who share this view: obligations established by reason do not depend upon reaching puberty, but are binding even before puberty, unlike obligations established by revelation.
He said:
“It was argued that if reason imposed obligations and prohibitions, knowledge of good and evil would necessarily have a foundation among the first principles of reason, upon which everything else would rest. Do you not see that eternity and temporal origination have such a foundation? If that were so, anyone denying good and evil would be defying his own reason and deceiving himself, for whoever denies what is self-evidently established is obstinately denying the obvious.”