As long as the body is not in perfect health, you think about it, and that prevents you from thinking of the mind. The sound mind is a sound body.
B.K.S. IyengarThe needs of the body are the needs of the divine self, which lives through the body.
B.K.S. IyengarA scientist sets out to conquer nature through knowledge - external nature, external knowledge. By these means he may split the atom and achieve external power. A yogi sets out to explore his own internal nature, to penetrate the atom (atma) of being. He does not gain dominion over wide lands and restless seas, but over his own recalcitrant flesh and febrile mind.
B.K.S. Iyengar