Regarding Dr. Bagchee - we must always know that we are executing the topmost yoga system, Krishna Consciousness, and we do not require any inferior quality yoga system. You must have read in Bhagavad-gita in the 6th chap., last verse, that one who is constantly in Krishna Consciousness, he is the topmost yogi [Bg 6.47]. So the process which we have adopted cannot be compared even with any other yoga system. That is a fact.
Letter to Aniruddha, 19 October, 1968