Music cannot be called otherwise than the sister of painting, for she is dependent upon hearing, a sense second to sight, and her harmony is composed of the union of its proportional parts sounded simultaneously, rising and falling in one or more harmonic rhythms.

Those who fall in love with practice without science are like a sailor who enters a ship without a helm or a compass, and who never can be certain whither he is going.

When you are painting you should take a flat mirror and often look at your work within it, and it will then be seen in reverse, and will appear to be by the hand of some other master, and you will be better able to judge of its faults than in any other way.

The part always has a tendency to reunite with its whole in order to escape from its imperfection.

Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.

Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.

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