The readings for Palm Sunday are taken from Isaiah 50:4-9; Philippians 2:5-11; and John 12:12-43.
The prophet Isaiah describes the Messiah in great detail. God is with and well-pleased with His incarnate Son who carried on His back and against His face all the rebellion of all people and the disastrous consequences of it all. The shame of us all that Jesus carried was not a disgrace to Him, but a witness to His profound and unparalleled love that redeemed us.
Philippians describes in more comprehensive terms what Isaiah prophesied. This mind of Christ is what God has given us, along with His heart and what He cares about, in our souls regenerated and animated by His Holy Spirit.
John offers a very practical example of how Jesus keeps coming down lower in order to be among everyone. From His incarnation to His birth from a lowly virgin in lowly Bethlehem in a lowly stable to His accessibility among the people who knew their need for Him. He even chooses lowly, common elements to join with His Word to confirm His saving work in our lives: water, bread, wine, and the human voice expressing His forgiveness and promises.