All other living beings have only what is necessary for self-preservation, but man is superior to this.And is it not strange that it is this superfluous capacity that leads to man's unhappiness?In every piece of land, the output of human labor exceeds his survival needs, but whoever has enough wisdom to ignore the excess will always be rich, because there will not be too many "grand needs".It is because we try to increase happiness that we become miserable.If people are satisfied with life, they will live happily, then they are naturally good people, and what good can evil do to them?