„The answer was we thought it could be done.“

— Elon Musk
„You could attach prices to thoughts. Some cost a lot, some a little. And how does one pay for thoughts? The answer, I think, is: with courage.“
— Ludwig Wittgenstein
„Let these words answerFor what is done, not to be done againMay the judgement not be too heavy upon us“
— T.S. Eliot
„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
„I thought… that we could at least talk about books.“
— Cassandra Clare
„The Wrong we have Done, Thought, or Intended Will wreak its Vengeance onOur SOULS.“
— C.G. Jung