"Whatever perfection exists in an effect must be found in the effective cause: either in the same formality, if it is a univocal agent (...) thus in the sun is the likeness of whatever is generated by the sun's power. Now it is plain that the effect pre-exists virtually in the efficient cause: and although to pre-exist in the ..."
"There are some which proceed from a principle known by the natural light of intelligence, such as arithmetic and geometry and the like. There are some which proceed from principles known by the light of a higher science: thus the science of perspective proceeds from principles established by geometry, and music from principles established by arithmetic. ..."
"Videmus enim formas non esse intelligibiles in actu nisi secundum quod separantur a materia et a condicionibus eius; nec efficiuntur intelligibiles in actu, nisi per virtutem substantiae intelligentis secundum quod recipiuntur in ea et secundum quod aguntur per eam. Unde oportet quod in qualibet substantia intelligente sit ..."
"...this is why a natural agent does not produce being simpliciter, but instead produces being that preexists and is determined to this or to that, e.g., to this species of fire, or to whiteness, or to something of the sort. And because of this a natural agent acts by moving, and so it requires matter, which is the ..."