Nature alone is the master of true genius.

Those who are inspired by a model other than Nature, labor in vain.

The Medici created and destroyed me.

He turns not back who is bound to a star.

Those who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.

Medicine is the restoration of discordant elements; sickness is the discord of the elements infused into the living body.

When you are alone you are all your own.