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

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

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.

That which lives on reason lives against the spirit.

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.

However, anyone to whom this happens should not leave his room upon awakening, should speak to no-one, but remain alone and sober until everything comes back to him, and he recalls the dream.

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