Drityigri Thayam is focused intent with patients. Drityigri Gritaya, the next part with focused intent. Aparak Shana Bhuti. Vayak Shuramini. Not all of them will do. It will teach you a methodology of doing this stage by stage withdrawal. So Buddha, by knowledge, what knowledge? Whatever you have gained so far, that knowledge has to be applied when you sit down and meditate.