When I first started reading about Rev. Martin Luther King Jr., I kept coming across one name: Reinhold Niebuhr.

Niebuhr was a Protestant pastor and theologian who lived during the mid-20^th century. He’s best known for writing the Serenity Prayer ("God grant me the serenity to accept the things I cannot change, the courage to change the things I can..."). But he also exerted a profound influence on King.

It turns out that Niebuhr is also one of President Obama’s favorite theologians, as I detailed in an article earlier this year.

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