Whenever asana is done mechanically from the front brain, the action is felt only on the peripheral body, and there is no inner sensation, there is no luminous inner light. If the asana is done with continual reference to the back of the brain, there is a reaction to each action, and there is sensitivity. Then life is not only dynamic, but it is also electrified with life force.
B.K.S. IyengarAction is movement with intelligence. The world is filled with movement. What the world needs is more conscious movement, more action.
B.K.S. IyengarA lamp does not flicker in a place where no wind blows; so it is with a yogi, who controls his mind, intellect and self, being absorbed in the spirit within him.
B.K.S. Iyengar