 Conceptualizing the true nature of “all-at-once,” “not-all-at-once” and “gradual” are all primitive conceptualizations owing to the aid of sensation. Sure, we understand that these things are known only by reason of the now and time, but that requires a demonstration. It is possible that the true nature of motion is known by these things, and thereafter motion fixes a knowledge of time and the now, which are reasons for those first things’ being conceptualized, but in that case no circle is entailed. This is a fine answer. (ar-Rāzī, Fakhr al-Dīn, 1990, vol. 1, 670)