The knowledge of anything, since all things have causes, is not acquir… — Quoted

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

Avicenna · Knowledge

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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.

Knowledge

Avicenna

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

Health

Avicenna

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

Men

H. G. Wells

Nothing leads so straight to futility as literary ambitions without systematic knowledge.

Knowledge