He who has a "why" to live for can accommodate almost any "how".
~Nietzsche

"Man is born a freak of nature. Being within nature and yet transcending it. He has to find principals of actions and decision making which replace the principals of instincts. He has to protect himself not only against the danger of losing his own life but also against the danger of losing his mind."

Erich Fromm (1930'ish)

"Those who can accept their sin can live with their sin."

C. Jung