I think one of his best quotes is this-

“I find that you have to blend in like a fish in water, you have to forget yourself, you have to take your time, that's what I reproach our era for not doing. Drawing is slow, it is a meditation, but you have to know how to go slow in order to go quickly, slowness can mean splendour. - Henri Cartier-Bresson

The reason I like this quote is because it is almost a dichotomy of the technique he employed.