The first movement must be obviously to get rid of desire which is the whole root of the evil and suffering; and in order to get rid of desire, we must put an end to the cause of desire, the rushing out of the senses to seize and enjoy their objects. We must draw them back when they are inclined thus to rush out, draw them away from their objects, – as the tortoise draws in his limbs into the shell, so these into their source, quiescent in the mind, the mind quiescent in intelligence, the intelligence quiescent in the soul and its self-knowledge, observing the action of Nature, but not subject to it, not desiring anything that the objective life can give.
Ref: Essays on Gita