-
A horse is simply a horse.
Avicenna -
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.
Avicenna
-
Pain is a sensation produced by something contrary to the course of nature and this sensation is set up by one of two circumstances: either a very sudden change of the temperament (or the bad effect of a contrary temperament) or a solution of continuity.
Avicenna -
That whose existence is necessary must necessarily be one essence.
Avicenna -
The world is divided into men who have wit and no religion and men who have religion and no wit.
Avicenna -
The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.
Avicenna