The book of Nature is that which the physician must read; and to do so he must walk over the leaves.

He who knows nothing loves nothing. He who can do nothing understands nothing. He who understands nothing is worthless. But he who understands also loves, notices, sees. The more knowledge is inherent in a thing, the greater the love.

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.

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.

I am different. Let this not upset you

All things are poisons. It is simply the dose that distinguishes between a poison and a remedy.

Know that the philosopher has power over the stars, and not the stars over him.