Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.
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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 →