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.

Everything in excess is opposed to nature.

Cure sometimes, treat often, comfort always.

The patient must combat the disease along with the physician.

It is better to be full of drink than full of food.

Science is the father of knowledge, but opinion breeds ignorance.

Sometimes give your services for nothing.