H.C-B never really knew what he had until somebody pushed a pile of contact sheets under his nose. It is no hugely clever thing to discover a few nice results among thousands and thousands (and thousands) of discards.
The real secret to H.C-B's output is obsessive and brutal shooting backed up by dedicated darkroom workers.
Wait. You mean, it wasn't the Leica?
I photograph things to see what things look like photographed.
- Garry Winogrand