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.]
life without love, is no life at all
I shall do down in history as the man who opened a door!
...The world wouldn't be the world, without trouble.
Those who are inspired by a model other than Nature, labor in vain.
The boundaries of bodies are the least of all things.