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

Nature is a light, and by looking at Nature in her own light we will understand her. Visible Nature may be seen in her visible light; invisible Nature may become visible if we acquire the power to perceive her invisible light.

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

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 highest degree of a medicine is Love.

Since nothing is so secret or hidden that it cannot be revealed, everything depends on the discovery of those things that manifest the hidden.

For it is we who must pray for our daily bread, and if He grants it to us, it is only through our labour, our skill and preparation.