As a photographer, the words below offer me inspiration to understand and practice this form of art.
"You know, there is no proof in art, only assertions. Someone says that a particular piece of work is good or bad, for any misguided or corrupt reason you might care to name, and there is no way to prove him otherwise. You can only say that he is wrong, and if he is well placed, you are alone. There is such a great danger in the arts, always, and especially to the young artists who has not yet found a core of truth from which he can work--there is such a danger of sinking into a swamp of subjectivity, of polite relativism." --Garry Winogrand