The concepts of the abyss, crossing the abyss, ego death, and the dark night of the soul are all interrelated and have different contextual emphasis whether viewed through an occult lens visa vie Aleister Crowley, a Jungian psychoanalytical lens, spiritual awakening, and other modalities or lens of Qabbalistic/Qlippothic studies and practices.
What does this all mean and how do you know if you have even scratched the surface on all three? Simply put, you won’t know, until you REALLY KNOW.