The negative is the equivalent of the composer's score, and the print the performance. - Ansel Adams
 
Pay no heed to the average photographer's remarks upon "flat" and "weak" negatives. Probably he is flat, weak, stale, and unprofitable; your negative may be first-rate, and probably is if he does not approve of it. - Ralph Waldo Emerson
 
Logicians tell us that two Negatives make an Affirmative. Will somebody say how many Negatives make a Photographer ? - Anonymous - Punch, 12 October 1872 [cited in: Creative Camera January 1970, p. 4]
 
I wish to state emphatically that I do not believe in any sort of handwork or manipulation on a photographic negative or print. - Alvin Langdon Coburn - 1913, expressing his belief in “straight” photography., 1000 Photo Icons by Anthony Bannon (Foreword), George Eastman House , ISBN: 3822820970 , Page: 420