Avicenna said this quote

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

Famous Quotes of Avicenna

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Anyone who denies the law of non-contradiction should be beaten and burned until he admits that to be beaten is not the same as not to be beaten, and to be burned is not the same as not to be burned.

~ Avicenna

The world is divided into men who have wit and no religion and men who have religion and no wit.

~ Avicenna

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.

~ Avicenna

Therefore in medicine we ought to know the causes of sickness and health.

~ Avicenna