Just as courage imperils life, fear protects it.

Just as courage imperils life, fear protects it.

Love shows itself more in adversity than in prosperity; as light does, which shines most where the place is darkest.

An arch consists of two weaknesses which, leaning one against the other, make a strength.

When you are painting you should take a flat mirror and often look at your work within it, and it will then be seen in reverse, and will appear to be by the hand of some other master, and you will be better able to judge of its faults than in any other way.

Who would believe that so small a space could contain the images of all the universe?

Now do you not see that the eye embraces the beauty of the whole world? It counsels and corrects all the arts of mankind... it is the prince of mathematics, and the sciences founded on it are absolutely certain. It has measured the distances and sizes of the stars it has discovered the elements and their location... it has given birth to architecture and to perspective and to the divine art of painting.