Loneliness is a complex mental and emotional phenomenon that has at its core a powerful emotion that has survival value for children.We have all experienced some degree of abandonment, if only for a short time, and we remember the painful and frightening feeling that comes with it.When you feel lonely, it's because something triggered a memory of that feeling, not because you are in fact isolated and alone. The brain is designed to pay attention to pain and danger, and this includes painful frightening feelings; therefore loneliness holds our attention.
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The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.