A documentary photograph is not a factual photograph.
go in over your head, not just up to your neck.
The visual life is an enormous undertaking, practically unattainable.
That frame of mind that you need to make fine pictures of a very wonderful subject, you cannot do it by not being lost yourself.
Photographers stop photographing a subject too soon before they have exhausted the possibilities.
It is no accident that the photographer becomes a photographer any more than the lion tamer becomes a lion tamer.