Therefore in medicine we ought to know the causes of sickness and health.
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About Avicenna
Avicenna was Persian polymath, physician and philosopher (c. 980–1037). Ibn Sina, commonly known in the West as Avicenna, was a preeminent philosopher and physician of the Muslim world. He was a seminal figure of the Islamic Golden Age, serving in the courts of various Iranian rulers, and was influential to medieval European medical and Scholastic thought. Read more on Wikipedia →