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.

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.

Then God sends us such a messenger who appears to us in spirit, warns us, consoles us, teaches us, and brings us His good tidings.

This process is alchemy: its founder is the smith Vulcan.

The beginning of wisdom is the beginning of supernatural power.

Every physician must be rich in knowledge, and not only of that which is written in books; his patients should be his book, they will never mislead him.

What the eyes perceive in herbs or stones or trees is not yet a remedy; the eyes see only the dross.