The moment is timeless.

Great love is born of great knowledge of the thing that is loved, and if you do not know it, you can love it little or not at all.

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.

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

No human investigation can be called real science if it cannot be demonstrated mathematically.

Shadow is the diminution alike of light and of darkness, and stands between darkness and light.

Painting is concerned with the ten things you can see: these are darkness and brightness, substance and color, form and place, remoteness and nearness, movement and rest.