The world is divided into men who have wit and no religion and men who have religion and no wit.
Scientists
Avicenna
Persian polymath born in 980 near Bukhara whose Canon of Medicine served as the standard medical textbook in Europe and the Islamic world for centuries. He also made major contributions to philosophy and science.
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Avicenna's Other Quotes
The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.
Medicine is the science by which we learn the various states of the human body in health and when not in health, and the means by which health is likely to be lost and when lost is likely to be restored.