Two great quotes by Ernest Becker:
"Excreting is the curse that threatens madness because it shows man his abject finitude, his physicalness, the likely unreality of his hopes and dreams. But even more immediately, it represents man's utter bafflement at the sheer non-sense of creation: to fashion the sublime miracle of the human face, the mysterium tremendum of radiant feminine beauty, the veritable goddesses that beautiful women are; to bring this all out of nothing, out of the void, and make it shine in noonday; to take such a miracle and put miracles again within it, deep in the mystery of eyes that peer out — the eye that gave even the dry Darwin a chill; to do all this, and to combine it with an anus that shits! It is too much. Nature mocks us, and poets live in torture."
"Man is out of nature and hopelessly in it; he is dual, up in the stars and yet housed in a heart-pumping, breath-gasping body that once belonged to a fish and still carries the gill-marks to prove it. His body is a material fleshy casing that is alien to him in many ways—the strangest and most repugnant way being that it aches and bleeds and will decay and die. Man is literally split in two: he has an awareness of his own splendid uniqueness in that he sticks out of nature with atowering majesty, and yet he goes back into the ground a few feet in order blindly and dumbly to rot and disappear forever.”