Let me here call attention to one of the most universally popular mistakes that have to do with photography - that of classing supposedly excellent work as professional, and using the term amateur to convey the idea of immature productions and to excuse atrociously poor photographs. As a matter of fact nearly all the greatest work is being, and has always been done, by those who are following photography for the love of it, and not merely for financial reasons. As the name implies, an amateur is one who works for love; and viewed in this light the incorrectness of the popular classification is readily apparent.
Alfred Stieglitz, 1899