What is God's?
Psalm 24:1 “The earth is the Lord's and the fulness therof”
Romans 12:1 “I beg you.... to present your bodies as a living sacrifice...”
As Dorothy Day observed, “if we have rendered everything to God, what is left for Caesar?”
The Roman coin was stamped in the image of Caesar and Jesus says it is OK to give it back to Caesar. Then he says give to God that which is God's. So the question is: What is stamped or made in the image of God?
Answer: Man
For Gen 1:26 states And God said, Let us make man in our image, after our likeness.
So it seems we have to give ourselves back to God.