Avicenna (Ibn Sina):

Sleep is the absence of waking, just as death is the absence of life.

— Avicenna (Ibn Sina) Medieval

Persian polymath, Canon of Medicine

From 'The Canon of Medicine'

1025

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"The world is not a prison, but a kind of school."

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"The best way to learn is to teach."

"The wise man does not grieve for what he has not, but rejoices in what he has."