For those colours which you wish to be beautiful, always first prepare a pure white ground.
Whoever does not respect life, does not deserve it.
Where there is shouting, there is no true knowledge.
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.]
The natural desire of good men is knowledge.
Everything proceeds from everything else and everything becomes everything, and everything can be turned into everything else.