Where there is most feeling, there is the greatest martyrdom.

Everything comes from everything, and everything is made out of everything, and everything returns into everything.

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.

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.

To speak well of a base man is much the same as speaking ill of a good man.

When the thing taken into union is perfectly adapted to that which receives it, the result is delight and pleasure and satisfaction.

A diamond is just a lump of coal that stuck to its job.