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.]

Learning never exhausts the mind.

How many emperors and how many princes have lived and died and no record of them remains, and they only sought to gain dominions and riches in order that their fame might be ever-lasting.

We know more about the movement of celestial bodies than about the soil underfoot.

Good writing comes from good talent.

Art is the queen of all sciences communicating knowledge to all the generations of the world.

Great love is born of great knowledge of the thing that is loved, and if you do not know it, you can love it little or not at all.