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

The art of healing comes from nature, not from the physician. Therefore the physician must start from nature, with an open mind.

That which lives on reason lives against the spirit.

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.

All drugs are poisons the benefit depends on the dosage.

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.

The physician must give heed to the region in which the patient lives, that is to say, to its type and peculiarities.