Meta Maths!: The Quest for Omega https://books.google.com/books?id=ZACLDQAAQBAJ&pg=PA11. Vintage Books (2006). p. 11
“However difficult it may be to accept what happens to us, one must understand that moments such as this give us the possibility for radical change in our behavior.”
Source: Warrior of the Light
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Paulo Coelho 844
Brazilian lyricist and novelist 1947Related quotes
Opera and Humour (1991)

Prayer from Apollo 8, on Christmas Day (25 December 1968)
Context: Give us, O God, the vision which can see Your love in the world in spite of human failure.
Give us the faith to trust Your goodness in spite of our ignorance and weakness.
Give us the knowledge that we may continue to pray with understanding hearts.
And show us what each one of us can do to set forward the coming of the day of universal peace.
Nobel Lecture (11 December 1926) http://nobelprize.org/nobel_prizes/physics/laureates/1926/perrin-lecture.html

Niebuhr's preferred form, as declared by his widow
The Serenity Prayer (c. 1942)
Variant: God, give us grace to accept with serenity the things that cannot be changed, courage to change the things which should be changed, and the wisdom to distinguish the one from the other.

From the last letter received by his family on September 1974 http://www.memoriayjusticia.cl/english/en_focus-llido.html.

“It's not what happens to us, but our response to what happens to us that hurts us.”
Source: The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change