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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
Causes, All Things, Known
"On Medicine". Essay by Avicenna (circa 1020), as quoted in "The Sacred Books and Early Literature of the East" edited by Charles F. Horne (Volume VI "Medieval Arabia", pp. 90-91), sourcebooks.fordham.edu. 1917.
The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.