He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

It's easier to resist at the beginning than at the end.

Experience, the interpreter between creative nature and the human race, teaches the action of nature among mortals: how under the constraint of necessity she cannot act otherwise than as reason, who steers her helm, teaches her to act.

Sculptured figures which appear in motion, will, in their standing position, actually look as if they were falling forward.

Be a mirror, absorb everything around you and still remain the same

He who does not understand the supreme certainty of mathematics is wallowing in confusion.

In life beauty perishes, but not in art.