Dr King while making use of an allusion refers to the Reverend Rein hold Niebuhr who was a theologian from America.
Explanation:
He was also a professor and an intellectual who was leading during the time of the twentieth century. He used it to strengthen his argument by saying that Niebuhr had written many influential books and those books spoke about the morality of the individual in comparison to the immorality of the society. The writing about the serenity prayers are also his contributions. This was used by king to strengthen his evidence.