"Be cheerful [and grateful for the good that you have]: do not brood over fond hopes unrealized until a chain is fastened on each thought and wound around the heart. Nature intended you to be the fountain-spring of cheerfulness and social life, and not the mountain of despair and melancholy."

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No one who has not had the responsibility can really understand what it is like to be President, not even his closest aides or members of his immediate family. There is no end to the chain of responsibility that binds him, and he is never allowed to forget that he is President.

— Harry S. Truman