From whiskey river’s commonplace book (first paragraph):

I’ve been thinking about something for a long time, and I keep noticing that most human speech – if not all human speech – is made with the outgoing breath. This is the strange thing about presence and absence. When we breathe in, our bodies are filled with nutrients and nourishment. Our blood is filled with oxygen, our skin gets flush; our bones get harder – they get compacted. Our muscles get toned and we feel very present when we’re breathing in. The problem is, that when we’re breathing in, we can’t speak. So presence and silence have something to do with each other...

(Li-Young Lee [source])