'When his mind, intellect and self are under control, freed from restless desire, so that they rest in the spirit within, a man becomes a Yukta - one in communion with God. A 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. When the restlessness of the mind, intellect and self is stilled through the practice of Yoga, the yogi by the grace of the Spirit within himself finds fulfillment.'
-from the Bhagavad Gita