The practice of yogasana for the sake of health, to keep fit, or to maintain flexibility is the external practice of yoga. While this is a legitimate place to begin, it is not the end. Even in simple asanas, one is experiencing the three levels of quest: the external quest, which brings firmness of the body; the internal quest, which brings steadiness of intelligence; and the innermost quest, which brings benevolence of spirit.
B.K.S. IyengarOur greed comes from our fear that we will not have enough - whether it is money or love that we grasp. Yoga teaches us to let go of these fears and so to realize the abundance around us and within us.
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. IyengarWe often fool ourselves that we are concentrating because we fix our attention on wavering objects.
B.K.S. Iyengar