O painter skilled in anatomy, beware lest the undue prominence of the bones, sinews and muscles cause you to become a wooden painter from the desire to make your nude figures reveal all.

The desire to know is natural to good men.

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.

Every part is disposed to unite with the whole, that it may thereby escape from its own incompleteness.

Nothing is so much to be feared as Evil Report.

But to me all sciences seem vain and full of error that are not born of experience, mother of all certainty, and do not terminate in an actual experience.

When taking a selfie, remember the most natural pose is still best