"In order that there be generation three things are required: being in potency which is matter, non-existence in act which is privation, and that through which something comes to be in act which is form." (Aquinas, c. 1255/1952)
"Anyone who thinks that he understands the divine scriptures or any part of them, but cannot by his understanding build up the double love of God and neighbour, has not yet understood them as he ought." (De doctrina christiana, 1.36.40)
"Because the Trinity is ineffable, it is more true to say what it is not than what it is; for our words are but mirrors that break the light of the divine essence into fragments." (De Trinitate, 5.1.1)
"Two loves have built two cities: the love of self, even to the contempt of God, the earthly city; and the love of God, even to the contempt of self, the heavenly city." (De civitate Dei, 14.28)
1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things came into being through him, and without him not one thing came into being. What has come into being 4 in him was life,[a] and the life was the light of all people. 5 The light shines in the darkness, and the darkness did not overtake it.
"Evil is not a substance, but a perversion of the will which turns away from the higher things to the lower." (De libero arbitrio, 2.19)
"Do not go outside yourself; return into yourself. Truth dwells in the inner man, and if you find your own nature to be mutable, transcend even yourself." (De quantitate animae, 33.72)
"The truth is eternal; and because the soul is capable of apprehending eternal truth, it must possess a nature that is not confined by the limits of time and physical dissolution." (De immortalitate animae, 12.19)
"Do not go abroad. Return within yourself. In the inward man dwells truth." (Soliloquia, 1.1.2)
"The beauty of the whole is composed of parts, and in this divine arrangement, there is nothing that is not in its own way beautiful, even if it appears otherwise to the limited perception of the observer." (De ordine, 2.19.50)