Every obstacle is destroyed through rigor.

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

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

I roamed the countryside searching for answers to things I did not understand. Why shells existed on the tops of mountains. How the various circles of water form around the spot which has been struck by a stone, and why a bird sustains itself in the air.

The eye transmits its own image through the air to all the objects which face it, and also receives them on its own surface, whence the "sensus communis" takes them and considers them.

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.

The worst evil which can befall the artist is that his work should appear good in his own eyes.