Frederic Leighton to James McNeill Whistler: 'My dear Whistler, you leave your pictures in such a sketchy, unfinished state. Why don't you ever finish them?' James McNeill Whistler to Frederic Leighton: 'My dear Leighton, why do you ever begin yours?

We look at a painting to know the painter; it's his company we are after, not his skill.

Art should be independent of all clap-trap - should stand alone, and appeal to the artistic sense of eye or ear, without confounding this with emotions entirely foreign to it, as devotion, pity, love, patriotism and the like. All these have no kind of concern with it; and that is why I insist on calling my works 'arrangements' and 'harmonies.

The world is divided into two classes - invalids and nurses.

As light fades and the shadows deepen, all petty and exacting details vanish, everything trivial disappears, and I see things as they are in great strong masses: the buttons are lost, but the sitter remains; the sitter is lost, but the shadow remains; the shadow is lost, but the picture remains. And that, night cannot efface from the painter's imagination.

A student of James McNeill Whistler tells the great artist, 'I tend to paint what I see.' Whistler replies, 'Ah! The shock will come when you see what you paint!

The work of a master reeks not of the sweat of the brow - suggests no effort - and is finished from its beginning.