The photographer Henri Cartier-Bresson (1908-2004) was the Zen master of the decisive moment. One can get a perfect photograph only when they eye, heart and mind are aligned right. One has to seize the moment, the moment of truth. You can't get a picture if you want it -- they come and bite you. If you want, you don't get anything. You either get it or you don't get it.
Can you seize the decisive moment, or will you lose it forever?