The experience of ananda in savikalpa samadhi has to cease before you can have the deeper nirvikalpa samadhi. Agitations of the mind are released by the attainment of shanti in the anahata and vishuddha chakras. Only man can experience Satchidananda, the all pervasiveness of God. Understanding where we are in consciousness. The realization of one's self as a soul is the first stage of Self Realization, then Satchidanada, then Parasiva.
Master Course, Merging with Siva, Lesson 365
Master Course, Dancing with Siva, Lesson 1
Patanjali's Yoga Sutras, Cessation of Bliss