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.

De Trinitate IX, 6, 11.