The second reading at today's Mass is the great kenotic hymn--so called because it sings of Jesus' kenosis or emptying of Himself into the Incarnation: the hymn is also used each week as the canticle for the First Vespers on the Eve of each Sunday:
Jesus Christ, although he shared God’s nature, did not try to seize equality with God for himself; but emptied himself, took on the form of a slave, and became like a man – not in appearance only, for he humbled himself by accepting death – even death on a cross.
For this, God has raised him high, and given him the name that is above every name,
so that at the name of Jesus every knee will bend, in heaven, on earth, and under the earth,
and every tongue will proclaim “Jesus Christ is Lord”, to the glory of God the Father.
This hymn, re-sung as the Christus factus est during Holy Week, sings of the great deeds of Jesus, the Second Person of the Holy Trinity. It bears re-singing and re-singing, as every knee bends and every tongue sings.