It should be forbidden and severely punished to remove cancer by cutting, burning, cautery, and other fiendish tortures. It is from nature that the disease comes, and from nature comes the cure, not from physicians.

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

Everything is a drug; it depends on the dose.

Medicine is not only a science; it is also an art. It does not consist of compounding pills and plasters; it deals with the very processes of life, which must be understood before they may be guided.

Women's regular bleeding engenders phantoms.

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

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.