And since geometry is the right foundation of all painting, I have decided to teach its rudiments and principles to all youngsters eager for art. . .

What beauty is, I know not, though it adheres to many things.

Why has God given me such magnificent talent? It is a curse as well as a great blessing.

If a man devotes himself to art, much evil is avoided that happens otherwise if one is idle.

As I grew older, I realized that it was much better to insist on the genuine forms of nature, for simplicity is the greatest adornment of art.

Love and delight are better teachers than compulsion.

Sane judgment abhors nothing so much as a picture perpetrated with no technical knowledge, although with plenty of care and diligence.