A 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. IyengarThe whole thrust of yogic philosophical and scientific inquiry has therefore been to examine the nature of being, with a view to learning to respond to the stresses of life without so many tremors and troubles.
B.K.S. Iyengar