„Well, I know what I have to do, so it is simple. Duty is a wonderful thing. I do not know what I should have done without duty since young Tom died. You could have painted, he told himself. Or you could have done something useful. Maybe, he thought. Duty is simpler.This is useful, he thought. Do not think against it. It helps to get it over with. That’s all we are working for. Christ knows what there is beyond that.“

— Ernest Hemingway

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„"I know you don't have to help us out-it's a favor-""Stop. I don't do favors, Alec. I do things for you because-- well, why do you think I do them?“
— Cassandra Clare
„Do not think I do not know that Cecily wants you to return home with her. And do not think I do not know that you remain for Jem's sake.""And yours," he said before he could stop himself.“
— Cassandra Clare
„“Well, what are you doing? What have you done?”“I am sitting in this char,” said Poirot. “Thinking,” he added.“Is that all?” said Mrs. Oliver.“It is the important thing,” said Poirot.“
— Agatha Christie
„If things do go badly, will I wonder for the rest of my life what I might have done to help?“
— Ben Carson
„By far the most vital lesson I have ever learned is the importance of what we think. If I knew what you think, I would know what you are. Our thoughts make us what we are.“
— Dale Carnegie
„What I’m saying is, if God wanted to send us a message, and ancient writings were the only way he could think of doing it, he could have done a better job.“
— Carl Sagan