[Christ Jesus,] though he was in the form of God, did not regard equality with God something to be grasped. Rather, he emptied himself, taking the form of a slave, coming in human likeness; and found human in appearance, he humbled himself, becoming obedient to death, even death on a cross. Because of this, God greatly exalted him and bestowed on him the name that is above every name, that at the name of Jesus every knee should bend, of those in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
In The Impression of the Figure, 3 Letter & Spirit 26 (2007), Christoph Card. Schonborn tells us that St. Paul’s text is widely believed to quote (or at least paraphrase) an older text, composed roughly a decade after the crucifixion.