I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

To be a winner you must want to win but must know of the chance of losing and must not fear of it.

To speak of this subject you must... explain the nature of the resistance of the air, in the second the anatomy of the bird and its wings, in the third the method of working the wings in their various movements, in the fourth the power of the wings and the tail when the wings are not being moved and when the wind is favourable to serve as guide in various movements.

Nature varies the seed according to the variety of the things she desires to produce in the world.

The painter strives and competes with nature.

To such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another.

There are many kinds of beauty as people who possess it.