"Be careful, though." "Aren't I always?" "No, I think the word for how you usually are is 'reckless."

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And he knew that at that moment, they understood each other perfectly, and when he told her what he was going to do now, she would not say ‘be careful’ or ‘don’t do it’, but she would accept his decision because she would not have expected anything less of him.

— J. K. Rowling