If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into… - Immanuel Kant

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If you punish a child for being naughty, and reward him for being good, he will do right merely for the sake of the reward; and when he goes out into the world and finds that goodness is not always rewarded, nor wickedness always punished, he will grow into a man who only thinks about how he may get on in the world, and does right or wrong according as he finds advantage to himself.