When you are alone you are all your own.

The Medici made me and the Medici destroyed me.

Fire is to represent truth because it destroys all sophistry and lies; and the mask is for lying and falsehood which conceal truth.

All our knowledge has its origins in our perceptions.

He who does not understand the supreme certainty of mathematics is wallowing in confusion.

When you are alone you are all your own.

Although human ingenuity may devise various inventions which, by the help of various instruments, answer to one and the same purpose, yet will it never discover any inventions more beautiful, more simple or more practical than those of nature, because in her inventions there is nothing lacking and nothing superfluous; and she makes use of no counterpoise when she constructs the limbs of animals in such a way as to correspond to the motion of their bodies, but she puts into them the soul of the body.