Being willing is not enough. We must do.

Of the original phenomena, light is the most enthralling.

Those who are inspired by a model other than Nature, labor in vain.

The first of all simple colours is White ... We shall set down White for the representative of light, without which no colour can be seen; Yellow for the earth; Green for water; Blue for air; Red for fire; and Black for total darkness.

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.

Good culture is born of a good disposition; and since the cause is more to be praised than the effect, I will rather praise a good disposition without culture, than good culture without the disposition.

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.