Brian Duffy
[Photographer, b. 1933, London, d. 2010, London.]
One of the great problems with photography is that any twat you give a camera to can take a photograph. What that does to the photographer is immediately create an inferiority complex within him because anyone can do it, which of course they can. 
Man Ray (Emanuel Radnitsky)
[Artist, b. 1890, Philadelphia, Pennsylvania, d. 1976, Paris.]
Cut out the eye from a photograph of one who has been loved but is seen no more.Attach the eye to the pendulum of a metronome and regulate the weight to suit the tempo desired.
Keep going to the limit of endurance.
With a hammer well-aimed, try to destroy the whole at a single blow.
(1932, describing “Object To Be Destroyed,” made using a metronome and the photographed eye of artist, lover and collaborator Lee Miller who left him.)
Marc Riboud
[Photographer, b. 1923, St.-Genis-Laval, France, d. 2016, Paris.]
Instinctively, I feel that good photographs come from being surprised. Terry Richardson
[Photographer, b. 1965, New York, lives in New York.]
I don’t work off lights and angles; I work off emotions. A mood that I create. Jasper Johns
[Artist, b. 1930, Augusta, Georgia, lives in Sharon, Connecticut and the island of St. Martin.]
A picture ought to be looked at the same way you look at a radiator. William Mortensen
[Photographer and writer, b. 1897, Park City, Utah, d. 1965, Laguna Beach, California.]
Emotion may be expressed, or the utter lack of it may be expressed, but the only important fact is that of expression. Ishiuchi Miyako
[Photographer, b. 1947, Gunma Prefecture, Japan, lives in Tokyo.]
One must be a bit cold to be the one taking photos. Paolo Pellegrin
[Photographer, b. 1964, Rome, lives in Paris.]
We photographers live in a constant state of schizophrenia because of what we see, what we feel and what we have to overcome.