In forward bends, one uses the outer mind while in backbends the outer mind is silenced and the inner mind is made to work.
B.K.S. IyengarThe cure to combat the three Ss- stress, strain, and speed- can be found in three Ws- the work of devoted practice, the wisdom that comes of understanding the self and the world, and worship because ultimately surrendering to what we cannot control allows the ego to relax and lose the anxiety of its own infinitesimally small self in the infinitude of the divine.
B.K.S. IyengarIgnorance has no beginning, but it has an end. There is a beginning but no end to knowledge.
B.K.S. Iyengar