I have often thought that if photography were difficult in the true sense of the term -meaning that the creation of a simple photograph would entail as much time and effort as the production of a good watercolor or etching - there would be a vast improvement in total output. The sheer ease with which we can produce a superficial image often leads to creative disaster.

"A Personal Credo," in American Annual of Photography, vol. 58 (1944; repr. in Photographers on Photography, ed. By Nathan Lyons, 1966)

Photographers on Photography : A Critical Anthology by Nathan Lyons (Editor)

This book is available from Amazon