Changes in the structure of society are not brought about solely by massive engines of doctrine. The first flash of insight which persuades human beings to change their basic assumptions is usually contained in a few phrases.

The Cathedrals were built to the glory of God; New York was built to the glory of Mammon.

Fine colour implies a unified relationship, in which each part is subordinate to the whole, and the transitions between them are felt to be as precious and beautiful as the colours themselves. In fact, the colours themselves must be continuously modified and broken as part of the transition.

The great artist takes what he needs.

Ruthless, greedy, tyrannical, disreputable... they have had one principle worth all the rest, the principle of delight!

Almost all great painters in old age arrive at the same kind of broad, simplified style, as if they wanted to summarise the whole of their experience in a few strokes and blobs of colour.

The history of art cannot be properly understood without some reference to the history of science. In both we are studying the symbols by which man affirms his mental scheme, and these symbols, be they pictorial or mathematical, a fable or formula, will reflect the same changes.