The sun gives spirit and life to the plants and the earth nourishes them with moisture.

O Time with your teethy years! You swallow up all things little by little in a slow-motion, wrinkling process of dying.

Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

Movement will fail sooner than usefulness.

The art of procreation and the members employed therein are so repulsive, that if it were not for the beauty of the faces and the adornments of the actors and the pent-up impulse, nature would lose the human species.

A single and distinct luminous body causes stronger relief in the objects than a diffused light; as may be seen by comparing one side of a landscape illuminated by the sun, and one overshadowed by clouds, and illuminated only by the diffused light of the atmosphere.

Necessity is the mistress and guide of nature.