The more brilliant the lightning, the quicker it disappears.

Medicine deals with the states of health and disease in the human body. It is a truism of philosophy that a complete knowledge of a thing can only be obtained by elucidating its causes and antecedents, provided, of course, such causes exist. In medicine it is, therefore, necessary that causes of both health and disease should be determined.

It is in the nature of water ... to become transformed into earth through a predominating earthy virtue; ... it is in the nature of earth to become transformed into water through a predominating aqueous virtue.

I [prefer] a short life with width to a narrow one with length.

The different sorts of madness are innumerable.

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

Leeches should be kept a day before applying them. They should be squeezed to make them eject the contents of their stomachs.