Let no one who can be his own belong to another.
The book of Nature is that which the physician must read; and to do so he must walk over the leaves.
Time is a brisk wind, for each hour it brings something new.
All drugs are poisons the benefit depends on the dosage.
The dreams which reveal the supernatural are promises and messages that God sends us directly: they are nothing but His angels, His ministering spirits , who usually appear to us when we are in a great predicament.
Medicine rests upon four pillars - philosophy, astronomy, alchemy, and ethics.