Billy had a framed prayer on ...

Billy had a framed prayer on his office wall which expressed his method for keeping going, even though he was unenthusiastic about living. A lot of patients who saw the prayer on Billy’s wall told him that it helped them to keep going, too. It went like this: God grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom always to tell the difference. Among the things Billy Pilgrim could not change were the past, the present, and the future.
Billy had a framed prayer on his office wall which expressed his method for keeping going, even though he was unenthusiastic about living. A lot of patients who saw the prayer on Billy’s wall told him that it helped them to keep going, too. It went like this: God grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom always to tell the difference. Among the things Billy Pilgrim could not change were the past, the present, and the future.
 Kurt Vonnegut

Quotes from the same author

I think that novels that leave out technology misrepresent life as badly as Victorians misrepresented life by leaving out sex.
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 Kurt Vonnegut
She upset Billy simply by being his mother. She made him feel embarrassed and ungrateful and weak because she had gone to so much trouble to give him life, and to keep that life going, and Billy didn't really like life at all.
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 Kurt Vonnegut
Billy covered his head with his blanket. He always covered his head when his mother came to see him in the mental ward - always got much sicker until she went away. It wasn’t that she was ugly, or had bad breath or a bad personality. She was a perfectly nice, standard-issue, brown-haired, white woman with a high school education. She upset Billy simply by being his mother. She made him feel embarrassed and ungrateful and weak because she had gone through so much trouble to give him life, and to keep that life going, and Billy didn’t really like life at all.
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 Kurt Vonnegut
What I would really like to have been, given a perfect world, is a jazz pianist. I mean jazz. I don't mean rock and roll. I mean the never-the-same-twice music the American black people gave the world.
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 Kurt Vonnegut
Where is home? I've wondered where home is, and I realized, it's not Mars or someplace like that, it's Indianapolis when I was nine years old. I had a brother and a sister, a cat and a dog, and a mother and a father and uncles and aunts. And there's no way I can get there again.
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 Kurt Vonnegut