“There is nothing like losing all you have in the world for teaching you what not to do. And when you know what not to do in order not to lose money, you begin to learn what to do in order to win. Did you get that? You begin to learn!”

Source: Design and Control of Self-organizing Systems (2007), p. 133

Variant: Do not get rid of your hurts until you have learned all that they have to teach you.
Source: Falling Upward: A Spirituality for the Two Halves of Life

Source: Levels of Life

Cardinal Francis Spellman in Book 1. London: Mandarin, 1993, p. 67
The Lovers (1993)

Psychomagic: The Transformative Power of Shamanic Psychotherapy (2010)
Context: I say: "What you give, you give to yourself; what you do not give, you give up." And this is to say that whatever you do in the world, you do to yourself; and whatever you do not give to the world, you lose. If I keep my knowledge, I lose it. (...) One receives knowledge and gives it. When you give knowledge, you enrich yourself. If you do not give love, you are detracting from yourself. If I begin to help people, if I begin to heal people, I begin to heal. Do you understand? To be a therapist, you have to be a patient. The first thing to do to heal yourself is to heal others. I have one more saying: "I do not want anything for myself that I do not want for others".

Illusions : The Adventures of a Reluctant Messiah (1977)
Source: Illusions: The Adventures of a Reluctant Messiah

Pt. 2: Cuba (a few paragraphs from the end). The 'boy' is Thomas Hudson's last surviving son, Tom, a fighter pilot who was killed in action.
Islands in the Stream (1970)

Source: Jesus and the Disinherited

Source: Handle with Care