Alterius non sit qui suus esse potest. (Let no man belong to another that can belong to himself.)
The art of medicine cannot be inherited, nor can it be copied from books
Poison is in everything, and no thing is without poison. The dosage makes it either a poison or a remedy.
The dose makes the poison.
Medicine rests upon four pillars - philosophy, astronomy, alchemy, and ethics.
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.