But when we come to the mystery of breath, it is another domain altogether. The perceptible breath which the nostrils can feel as air drawn in and air going out, is only an effect of breathing. It is not breath. For the mystic, breath is that current which carries the air out and brings the air in. The air is perceptible, not the current; the current is imperceptible. It is a kind of ethereal magnetism, a finer kind of electricity, the current of which goes in and comes out, putting the air into action.