“God, grant me the serenity to accept things I cannot change, courage to change the things I can, and wisdom to know the difference” (adapted from a prayer by Reinhold Niebuhr, 1943, in Bartlett’s Familiar Quotations, 15th ed., p. 823).
"(Obama) is a pretty disciplined person,” Rhodes says. “He is this guy who takes a sweeping view of history. He has a serenity that I don’t have. I get more exercised.”
https://www.theguardian.com/film/2018/jan/13/ben-rhodes-barack-obama-serenity
Obama felt “serenity” during Trump’s “American carnage” inauguration speech
https://qz.com/1166470/barack-obama-felt-serenity-during-donald-trumps-american-carnage-inauguration-speech/