Ananda is the very essence of the Brahman, it is the supreme nature of the omnipresent Reality. The supermind itself in the descending degrees of the manifestation emerges from the Ananda and in the evolutionary ascent merges into the Ananda.
Aurobindo establishes Ananda as the ontological ground of both involution and evolution, the matrix from which supermind proceeds and into which it returns.
, The Life Divine, 1939thesis