Test knowledge through experience, be prepared to make mistakes, and be persistent about it.

When you draw a nude, sketch the whole figure and nicely fit the members to it and to each other. Even though you may only finish one portion of the drawing, just make certain that all the parts hang together, so that the study will be useful to you in the future.

The mind that engages in subjects of too great variety becomes confused and weakened.

The first of all simple colours is White ... We shall set down White for the representative of light, without which no colour can be seen; Yellow for the earth; Green for water; Blue for air; Red for fire; and Black for total darkness.

The natural desire of good men is knowledge.

The painter will produce pictures of little merit if he takes the works of others as his standard.

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