The knowledge of all things is possible
Nothing can be loved or hated unless it is first known.
A clever man without wisdom is like a beautiful flower without fragrance.
You don't get into trouble because of the things you don't know. It is the things you don't know you don't know that really get you into a mess.
It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.
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.]