"The study of astrology is necessary for medicine, and for the understanding of the future."

"It is better to learn from the infidels than to remain in ignorance."

"The common way of teaching is a hindrance to true knowledge."

"The philosophers of the ancients, and especially the Arabs, have excelled us in many things."

"The study of alchemy is not only useful, but necessary, for the perfection of all other sciences."