Avicenna

980–1037 · Persian polymath, physician and philosopher (c. 980–1037)

Topics: learning

• 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

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

  — Avicenna