The teenager asked: "How can I become a person who is happy for himself and can also bring happiness to others?"

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The wise man gave the boy four sentences.

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 The first sentence, treat yourself as someone else. When you feel pain and sadness, treat yourself as someone else, and your mind will become calmer.

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 The second sentence, treat others as yourself. Truly sympathize with others' misfortune, understand others' needs, and give appropriate help when others need help.

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 The third sentence, treat others as others. Fully respect the independence of each person, and under no circumstances may violate the core territory of others.

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 The fourth sentence, treat yourself as yourself. Because you love others, you have to love yourself.

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 The boy asked: "There are many contradictions between these four sentences. How can I unify them?"

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 The wise man said: "It's very simple, take a lifetime to experience it."

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 The boy was silent for a long time, then he bowed his head to say goodbye. Later, the teenager became a middle-aged man, and then became an old man. Long after he left this world, people still mentioned his name from time to time, saying that he was a wise man.

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 Treating ourselves as others can make us feel at peace; treating others as ourselves allows us to learn compassion; treating others as others allows us to understand respect; treating ourselves as ourselves allows us to understand self-love. Such a life will be a perfect life.