For one country is different from another; its earth is different, as are its stones, wines, bread, meat, and everything that grows and thrives in a specific region.

This is alchemy, and this is the office of Vulcan; he is the apothecary and chemist of the medicine.

The dose makes the poison.

And it is true, best is nothing concealed which shall not be discovered; for which cause a marvellous being shall come after me, who as yet lives not, and who shall reveal many things.

Everything is a drug; it depends on the dose.

What sense would it make or what would it benfit a physician if he discovered the origin of the diseases but could not cure or alleviate them?

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.