“That the Law calls for consideration of existing things by means of the intellect and for pursuing cognizance of them by means of it is evident from various verses in the Book of God (may He be blessed and exalted). There is His statement (may He be exalted), ‘Consider, you who have sight’ [59:2]; this is a text for the obligation of using both intellectual and Law-based syllogistic reasoning. And there is His statement (may He be exalted), ‘Have they not reflected upon the kingdoms of the heavens and the earth and what things God has created?’ [7:185]; this is a text urging reflection upon all existing things. And God (may He be exalted) has made it known that one of those whom He selected and venerated by means of this knowledge was Abraham (peace upon him); thus, He (may He be exalted) said, ‘And in this way we made Abraham see the kingdoms of the heavens and the earth, that he might be…’ [and so on to the end of] the verse [6:75]. And He (may He be exalted) said, ‘Do they not reflect upon the camels, how they have been created, and upon the heaven, how it has been raised up?’ [88:17]. And He said, ‘And they ponder the creation of the heavens and the earth’ — and so on, in innumerable other verses.”
Kitab Fasl Al-Maqal (The Decisive Treatise), translated by Charles E. Butterworth, page 2.