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 light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

For those colours which you wish to be beautiful, always first prepare a pure white ground.

I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

You grow in reputation like bread in the hands of a child.

All our knowledge originates in opinion.

Many will think they may reasonably blame me by alleging that my proofs are opposed to the authority of certain men held in the highest reverence by their inexperienced judgments; not considering that my works are the issue of pure and simple experience.