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“Do you know someone you would like to change and regulate and improve? Good!
That is fine. I am all in favor of it. But why not begin on yourself? From a purely selfish standpoint, that is a lot more profitable than trying to improve others—yes, and a lot less dangerous” (Carnegie 52).

Argues for positive reinforcement rather than negative reinforcement; negative reinforcement such as scolding can lead to resentment and hatred.