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

Everything is a drug; it depends on the dose.

All things are poisons, for there is nothing without poisonous qualities. It is only the dose which makes a thing poison.

Thoughts give birth to a creative force that is neither elemental nor sidereal. Thoughts create a new heaven, a new firmament, a new source of energy, from which new arts flow. When a man undertakes to create something, he establishes a new heaven.

Medicine rests upon four pillars - philosophy, astronomy, alchemy, and ethics.

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

Man is a microcosm, or a little world, because he is an extract from all the stars and planets of the whole firmament, from the earth and the elements; and so he is their quintessence.