I think of Henri as the philosopher of photography. His foreword in The Decisive Moment is such a pure distillation of his approach to making images and each line reads like a proverb.
I was fortunate enough to get a copy of it through interlibrary loan, and would be glad to share it if anyone's interested.
A while back this excellent account by a man who assisted & traveled with Mssr. Cartier-Bresson was posted on APUG.