In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.

We must doubt the certainty of everything which passes through the senses, but how much more ought we to doubt things contrary to the senses, such as the existence of God and the soul.

If a man has a tent made of linen of which the apertures have all been stopped up, and be it twelve bracchia across (over twenty-five feet) and twelve in depth, he will be able to throw himself down from any height without sustaining injury. [His concept of the parachute.]

Common Sense is that which judges the things given to it by other senses.

Reprove your friend in secret and praise him openly.

In rivers, the water that you touch is the last of what has passed and the first of that which comes; so with present time.

The painter's mind is a copy of the divine mind, since it operates freely in creating the many kinds of animals, plants, fruits, landscapes, countrysides, ruins, and awe-inspiring places.