Is it wrong to be Happy? Wisdom of Autobiography of a Yogi

Is it wrong to be happy when there's so much unhappiness and suffering in the world? Was Sartre right in saying "In this world that bleeds, all joy is obscene?" Does the law of duality mean that happiness is a delusion? What to do?
Wisdom of Autobiography of a Yogi by Paramhansa Yogananda
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