Christ Jesus humbled himself, becoming obedient to the point of death, even death on a cross. Because of this, God greatly exalted him and bestowed on him the name which 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. (Phil 2:1-11)
https://bible.usccb.org/bible/readings/100123.cfm
Saint Paul uses this early Christian hymn to encourage us to have the same mind and heart of Christ.