Origen

“ But if you cannot comprehend these things, then keep silence; do not expose your own ignorance, and do not accuse of blindness those who see, or of lameness those who run, while you yourselves are utterly lamed and mutilated in mind, and lead a merely animal life—the life of the body, which is the dead part of our nature. ”

“ As, then, among visible things the sun is neither the eye nor vision, but that which enables the eye to see, and renders vision possible, and in consequence of it visible things are seen, all sensible things exist and itself is rendered visible; so among things intelligible, that which is neither reason, nor intelligent perception, nor knowledge, is yet the cause which enables the reason to know, which renders intelligent perception possible; and in consequence of it knowledge arises, all things intelligible, truth itself and substance have their existence ”

“ Things are either intelligible, which we call substance—being; or visible, which we call becoming: [3] with the former is truth; from the latter arises error. Truth is the object of knowledge; truth and error form opinion. Intelligible objects are known by the reason, visible objects by the eyes; the action of the reason is called intelligent perception, that of the eyes vision. ”