Mathematics is the art of giving the same name to different things.
One geometry cannot be more true than another; it can only be more convenient.
Geometry is the art of correct reasoning from incorrectly drawn figures.
Why is it that showers and even storms seem to come by chance, so that many people think it quite natural to pray for rain or fine weather, though they would consider it ridiculous to ask for an eclipse by prayer.
It is by logic we prove. It is by intuition we discover.
Hypotheses are what we lack the least.