These aren't all exactly photography quotes, but they are quotes that I apply to photography.

A good composer does not imitate, he steals.
Igor Stravinsky

Art is either plagiarism or revolution.
Paul Guaguin

Good artists borrow. Great artists steal.
Pablo Picasso

The creation of something new is not accomplished by the intellect but by the play instinct acting from inner necessity. The creative mind plays with the objects it loves.
Carl Jung

I myself have always stood in awe of the camera. I recognize it for the instrument it is, part Stradivarius, part scalpel.
Irving Penn

If a guy buys a piano, he owns a piano. If a guy buys a camera, he's a photographer.

But with the practice of photography came the sad knowledge that there is no royal road to the taking of good pictures. Although money might be lavishly spent in the purchase of costly apparatus, yet it was soon found that some knowledge of chemistry, and some artistic taste, together with practice in manipulation, and neatness and accuracy in working, were indispensable to success.
History of Photography - W. Jerome Harrison, 1887

Learn the rules like a pro, so you can break them like an artist.
Pablo Picasso

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.
Oscar Wilde

To take a photograph is to align the head, the eye and the heart. It’s a way of life.
Henri Cartier-Bresson

Photography is work. The harder you work, the better the pictures will be.
Tom Rockwell