"Photography implies that we know about the world if we accept it as the camera records it. But this is the opposite of understanding, which starts from not accepting the world as it looks. All possibility of understanding is rooted in the ability to say no. Strictly speaking, one never understands anything from a photograph. Of course, photographs fill in blanks in our mental pictures of the present and the past ... The camera's rendering of reality must always hide more than it discloses."

"The limit of photographic knowledge of the world is that, while it can goad conscience, it can, finally, never be ethical or political knowledge. The knowledge gained through still photographs will always be some kind of sentimentalism, whether cynical or humanist. It will be a knowledge at bargain prices -- a semblance of knowledge, a semblance of wisdom; as the act of taking pictures is a semblance of appropriation, a semblance of rape. The very muteness of what is, hypothetically, comprehensible in photographs is what constitutes their attraction and provocativeness."

- Susan Sontag, On Photography