“In the Gilgamesh myth, the idea of the Perfect Man, the Complete Man, is that two-thirds of man is divine and one-third human. He is the man of woe and joy, the one who makes the two movements, high above and deep below. Gilgamesh is shown in greatest joy and deepest despair, rising to the greatest heights and descending to the lowest depths. The idea of the complete life is the enormous swing from high to low, from low to high; from extraversion to introversion and vice versa. If life does not contain the pairs of opposites, it is just a straight line. It is just as if you did not breathe, it is just as though you did not live.”
(Carl Jung, Dream Analysis: Notes of the Seminar Given in 1928-1930. Princeton University Press  pp. 100-101).