Inhaling is action, it is what you do, while exhaling is passive, it is letting go of action, or allowing the action to take place of itself by the return of the body and its inertia. There is a subtle kind of dialogue involved which underlies every kind of mental activity, a moving of the weight from one side to the other, a doing and a being done. The tone of relation of these determines the mood. This is perhaps the same as the yang and the yin, an interplay or weave right down into the core of the experiencing in time. When the yin, the passive, dull and bodily component predominates, like an overcast sky, it resumes its sway in every moment forestalling all lightness and covering over he intuition with a pall of befuddled skepticism.