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Try to learn to breathe deeply, really taste food when you eat, and when you sleep, really sleep. Try as much as possible to be wholly alive with all your might, and when you laugh, laugh like hell. And when you get angry, get good and angry. Try to be alive. You will be dead soon enough~Ernest Hemingway
Is not being happy the ultimate aim for everyone. These helpful rules will certainly contribute toward that end.
My philosophy -since the selfishness people are capable of can be overwhelming stick to this and you'll never be at their level...