It would be an error to try to build the Kingdom of Heaven upon envy. For nothing that is founded on envy can thrive; it must have another root.

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.

The art of medicine has its roots in the heart.

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.

Determined will is the beginning of all magical operations. It is because men do not perfectly imagine and believe the result, that the (occult) arts are so uncertain, while they might be perfectly certain.

Everything is a drug; it depends on the dose.

A mortal lives not through that breath that flows in and that flows out. The source of his life is another and this causes the breath to flow.