There are, in effect, two things, to know and to believe one knows; to know is science; to believe one knows is ignorance.

Life is short and the art long.

Whoever wishes to investigate medicine should proceed thus: In the first place, consider the seasons of the year and what effect each of them produces.

The function of protecting and developing health must rank even above that of restoring it when it is impaired.

I also maintain that clear knowledge of natural science must be acquired, in the first instance, through mastery of medicine alone.

All disease begins in the gut.

And if incision of the temple is made on the left, spasm seizes the parts on the right, while if the incision is on the right, spasm seizes the parts on the left.