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

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.

Medicine is not merely a science but an art. The character of the physician may act more powerfully upon the patient than the drugs employed.

The art of healing comes from nature, not from the physician. Therefore the physician must start from nature, with an open mind.

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.

Many have said of Alchemy, that it is for the making of gold and silver. For me such is not the aim, but to consider only what virtue and power may lie in medicines.

The human body is vapor materialized by sunshine mixed with the life of the stars.