The photographer's problem is ...

The photographer's problem is to see clearly the limitations and at the same time the potential qualities of his medium, for it is precisely here that honesty no less than intensity of vision is the pre-requisite of a living expression. The fullest realization of this is accomplished without tricks of process or manipulation, through the use of straight photographic methods.
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 Paul Strand

Quotes from the same author

It has always been my belief that the true artist, like the true scientist, is a researcher using materials and techniques to dig into the truth and meaning of the world in which he himself lives; and what he creates, or better perhaps, brings back, are the objective results of his explorations. The measure of his talent--of his genius, if you will--is the richness he finds in such a life's voyage of discovery and the effectiveness with which he is able to embody it through his chosen medium.
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 Paul Strand
And if you can find out something about the laws of your own growth and vision as well as those of photography you may be able to relate the two, create an object that has a life of its own, which transcends craftsmanship. That is a long road, and because it must be your own road nobody can teach it to you or find it for you. There are no shortcuts, no rules.
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 Paul Strand
The existence of a medium, after all, is its absolute justification, if as so many seem to think, it needs one and all comparison of potentialities is useless and irrelevant. Whether a water-color is inferior to an oil, or whether a drawing, an etching, or a photograph is not as important as either, is inconsequent. To have to despise something in order to respect something else is a sign of impotence. [emphasis added] Let us rather accept joyously and with gratitude everything through which the spirit of man seeks to an ever fuller and more intense self-realization.
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 Paul Strand
All good art is abstract in its structure.
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 Paul Strand
The camera machine cannot evade the objects which are in front of it. When the photographer selects this movement, the light, the objects, he must be true to them. If he includes in his space a strip of grass, it must be felt as the living differentiated thing it is and so recorded. It must take its proper but no less important place as a shape and a texture in relationship to the mountain tree or what not, which are included.
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 Paul Strand