Art is never finished, only abandoned.

Man's external form, marvellously constructed, is not much as compared with the divine soul that dwells inside that structure.

Study me, reader, if you delight in me, because on very few occasions shall I return to the world, and because the patience for this profession is found in very few, and only in those who wish to compose things anew. Come, oh men, to see the miracles that such studies will disclose to nature.

Everything proceeds from everything else and everything becomes everything, and everything can be turned into everything else.

Shadow is the diminution alike of light and of darkness, and stands between darkness and light.

Necessity is a guardian in Nature.

Now do you not see that the eye embraces the beauty of the whole world? It counsels and corrects all the arts of mankind... it is the prince of mathematics, and the sciences founded on it are absolutely certain. It has measured the distances and sizes of the stars it has discovered the elements and their location... it has given birth to architecture and to perspective and to the divine art of painting.