Consider that we shouldn't call our brother a fool, since we don't know ourselves what we are.

It is said that a wise man rules over the stars, but this does not mean that he rules over the influences which come from the stars in the sky. It means that he rules over the powers which exist in his own constitution.

The physician must give heed to the region in which the patient lives, that is to say, to its type and peculiarities.

The right dose differentiates a poison from a remedy

The universities do not teach all things ... so a doctor must seek out old wives, gypsies, sorcerers, wandering tribes, old robbers, and such outlaws and take lessons from them. A doctor must be a traveller . . . Knowledge is experience.

Time is a brisk wind, for each hour it brings something new.

The art of medicine cannot be inherited, nor can it be copied from books