"He made his colours, built his stretchers, plastered his canvas, painted his pictures, carpentered his frames, and painted them. 'Too bad I can't buy my own pictures,' he murmured aloud. 'Then I'd be completely self-sufficient.'"

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We are machines built by DNA whose purpose is to make more copies of the same DNA. ... This is exactly what we are for. We are machines for propagating DNA, and the propagation of DNA is a self-sustaining process. It is every living object's sole reason for living.

— Richard Dawkins