A dog has the soul of a philosopher.

If someone separated the art of counting and measuring and weighing from all the other arts, what was left of each (of the others) would be, so to speak, insignificant.

Then may we not fairly plead in reply that our true lover of knowledge naturally strives for truth, and is not content with common opinion, but soars with undimmed and unwearied passion till he grasps the essential nature of things with the mental faculty fitted to do so, that is, with the faculty which is akin to reality, and which approaches and unites with it, and begets intelligence and truth as children, and is only released from travail when it has thus reached knowledge and true life and satisfaction?

Experience proves that anyone who has studied geometry is infinitely quicker to grasp difficult subjects than one who has not.

I have hardly ever known a mathematician who was capable of reasoning.

The greatest wealth is to live content with little.

In order to be a good soldier it is necessary to know how to dance.