Avicenna (Ibn Sina):

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

— Avicenna (Ibn Sina) Medieval

Persian polymath, Canon of Medicine

From 'The Book of Healing' (Kitab al-Shifa)

1027

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"The proof of the existence of the soul is that you doubt."

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"The physician must be a man of honor, for he holds life in his hands."

"The soul is not in the body; rather, the body is in the soul."

"The best way to keep the body healthy is to keep the mind healthy."