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Ibn Khaldun, 1332-1406. Arab historian.
Geometry enlightens
the intellect and sets one's mind right. All its proofs
are very clear and orderly. It is hardly possible for errors to enter
into geometrical reasoning,
because it is well arranged and orderly. Thus, the mind that constantly
applies itself to geometry
is not likely to fall into error. In this convenient way, the person who
knows geometry acquires intelligence.
It has been assumed that the following statement was written upon
Plato's door: "No one who is not a geometrician
may enter
our house."
