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There are parallels between the Serenity Prayer and the Stoic Agenda ...
Christian theologian Reinhold Niebuhr (1892–1971)
God, give us grace to accept with serenity the things that cannot be changed, courage to change the things that should be changed, and the wisdom to distinguish the one from the other. (Reinhold Niebuhr)
To avoid unhappiness, frustration, and disappointment, we need to do two things: