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

We must turn to nature itself, to the observations of the body in health and in disease to learn the truth.

Men think epilepsy divine, merely because they do not understand it. We will one day understand what causes it, and then cease to call it divine. And so it is with everything in the universe.

Sometimes give your services for nothing.

First of all a natural talent is required; for when Nature opposes, everything else is in vain; but when Nature leads the way to what is most excellent, instruction in the art takes place.

Walking is a man's best medicine.

I have clearly recorded this: for one can learn good lessons also from what has been tried but clearly has not succeeded, when it is clear why it has not succeeded.