Before the Gospels were written, long before the creeds of the Church were hammered out, Christ followers in Philippi sang a hymn of the Christ who, «although he was in the form of God . . . emptied himself, taking the form of a slave, being born as are all humans.» But this emptied Christ never fit neatly into later theologies of the church, shaped by Greek thought, concerned with being and essence. In Philippians, Paul struggles, stumbling over his own awkward words to express his hope,...