Make an effort to collect the good features from many beautiful faces.

Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.

Experience does not err. Only your judgments err by expecting from her what is not in her power.

Art lives from constraints and dies from freedom.

Those who condemn the supreme certainty of mathematics feed on confusion, and can never silence the contradictions of the sophistical sciences which lead to eternal quackery.

Men of genius sometimes accomplish most when they work least, for they are thinking out inventions.

Fire is to represent truth because it destroys all sophistry and lies; and the mask is for lying and falsehood which conceal truth.