This is alchemy, and this is the office of Vulcan; he is the apothecary and chemist of the medicine.

The interpretation of dreams is a great art.

Every physician must be rich in knowledge, and not only of that which is written in books; his patients should be his book, they will never mislead him.

Some children are born from heaven and others are born from hell, because each human being has his inherent tendencies, and these tendencies belong to his spirit, and indicate the state in which he existed before he was born.

What the eyes perceive in herbs or stones or trees is not yet a remedy; the eyes see only the dross.

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.

From time immemorial artistic insights have been revealed to artists in their sleep and in dreams, so that at all times they ardently desired them.