The theme here is that Jesus was forsaken so that we might be accepted. Darkness is over the land for three hours and the veil of the temple is torn in two. The Centurion confesses that Jesus truly was the son of God, and Jesus commits Himself into His Father’s hands.
Romans 13:1-7
Each of these three sections are unique (at least in specifics) to Luke’s gospel. In the first, Jesus pauses on his journey to the cross (via dolorosa) to tell the women of Jerusalem to stop weeping for Him, but instead to weep for themselves. It is a striking story not told in the other gospels. Jesus then calls on God to forgive those who are sinning against Him. Third, one of the men on the cross cries to Jesus for salvation, and Jesus says, “Today you will see me in paradise."
The two main themes are (1) Jesus was declared to be innocent over and over, but He still died because He was a substitute for us. (2) Pilate ultimately caved because, though he knew the truth, he loved his power and position more than God.
Jesus endures betrayal, mocking, and a kangaroo court trial. In this we see Jesus suffering with and for us, his prophetic nature, and His divine sacrifice.
Romans 12:14-21
Jesus comes to the garden of Gethsemane to pray, and while there he has a wide arrange of responses (as seen by the section titles). Two major themes are submitting to God’s will and that the darkness seems to be winning.
Jesus just finished telling of His coming death, and the disciples respond by arguing about who is the greatest. Jesus teaches them about this and warns of coming falling away and persecution.
Judas agrees to betray Jesus, and Jesus celebrates the Passover with His disciples. He not only celebrates though, He shows them how it points to him.
Understanding Jesus two baptisms (water and then the cross) helps us understand baptism.