Just as a well-filled day brings blessed sleep, so a well-employed life brings a blessed death.

Whoever in debate quotes authority uses not intellect, but memory.

To lie is vile, to tell truth is excellent, if not noble.

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.

Learning is the only thing the mind never exhausts, never fears, and never regrets.

He who thinks little errs much.

A beautiful body perishes, but a work of art dies not.