Experience does not err. Only your judgments err by expecting from her what is not in her power.

Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer.

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

The merit of painting lies in the exactness of reproduction. Painting is a science and all sciences are based on mathematics. No human inquiry can be a science unless it pursues its path through mathematical exposition and demonstration.

The lie is so vile, that even if it were in speaking well of godly things, it would take off something from God's grace; and Truth is so excellent, that if it praises but small things they become noble.

I say that the power of vision extends through the visual rays to the surface of non-transparent bodies, while the power possessed by these bodies extends to the power of vision.