Lecture By Swami Tattwamayananda. We feel complete restfulness in Nidra, deep sleep and in Samadhi because there is no other. The difference is the lack of awareness of that knowledge in deep sleep. Awareness is important to make knowledge functional. Desire is replayed in sleep and in memory. Forgetfulness can free us from negative memories and memory of spiritually helpful experiences will take us forward. The best way to refine the mind is by doing good physical actions. We change the composition of the bag of Vrittis that constitute our character. We have much more freedom at the physical level. Verses: I.10, I.11, I.12