When you inhale, you are taking the strength from God. When you exhale, it represents the service you are giving to the world.
B.K.S. IyengarWhen you cannot hold the body still, you cannot hold the brain still. If you do not know the silence of the body, you cannot understand the silence of the mind. Action and silence have to go together. If there is action, there must also be silence. If there is silence, there can be conscious action and not just motion.
B.K.S. Iyengar