Pictures should never be ...

Pictures should never be posed. They are 'revealed' so must be accepted as they are. Left alone.
 Henri Cartier-Bresson

Quotes from the same author

Why do photographers start giving numbers to their prints? It’s absurd. What do you do when the 20th print has been done? Do you swallow the negative? Do you shoot yourself? It’s the gimmick of money.
 Henri Cartier-Bresson
For the world is movement, and you cannot be stationary in your attitude toward something that is moving.
 Henri Cartier-Bresson
Inside movement there is one moment in which the elements are in balance. Photography must seize the importance of this moment and hold immobile the equilibrium of it.
 Henri Cartier-Bresson
The intensive use of photographs by mass media lays ever fresh responsibilities upon the photographer. We have to acknowledge the existence of a chasm between the economic needs of our consumer society and the requirements of those who bear witness to this epoch. This affects us all, particularly the younger generations of photographers. We must take greater care than ever not to allow ourselves to be separated from the real world and from humanity.
 Henri Cartier-Bresson
Photography must seize upon this moment and hold immobile the equilibrium of it. The photographers eye is perpetually evaluating. A photographer can bring coincidence of line simply by moving his head a fraction of a millimeter. He can modify perspectives by a slight bending of the knees. By placing the camera closer to or farther from the subject, he draws a detail — and it can be subordinated, or he can be tyrannized by it.
 Henri Cartier-Bresson