(Should be relabeled Yogananda's temporary experience of Unity, since the experience faded out somewhat, leaving him in a dualistic state but accessible to the Celestial levels. The actual experience starts at about 6:50 and continues to about 13 min.
https://www.youtube.com/watch?v=QSRoFfBAzr4 https://www.youtube.com/watch?v=QSRoFfBAzr4
