De Trinitate IX, 6, 11.
Quote 04 19
When I evoke in my soul a well-formed and beautiful arch which I saw, let us say in Carthage, I have before me an object which came to me through the bodily senses and was registered in my memory. Now, I reproduce it through the imagination. But the ideal which I see and because of which the arch pleases me so much that, if the arch doesn’t please me, I myself can correct it. Thus, it is evident that we judge our images according to an ideal of eternal truth which we intuit through reason’s inward grasp.