Perspective is the rein and rudder of painting.

Constancy does not begin, but is that which perseveres.

The eye, the window of the soul, is the chief means whereby the understanding can most fully and abundantly appreciate the infinite works of Nature; and the ear is second.

... we might say that the earth has a spirit of growth; that its flesh is the soil, its bones the arrangement and connection of the rocks of which the mountains are composed, its cartilage the tufa, and its blood the springs of water.

Experiment is the sole interpreter of the artifices of Nature.

Your brain is much better than you think; just use it!

Supreme happiness will be the greatest cause of misery, and the perfection of wisdom the occassion of folly.