In Matthew 22:16-22 Christs enemies as him a question to try and trick him. His answer shuts them up but he was saying something far deeper that it looks. Yes Caesar had his image and inscription on the money. But as seen in this verse God has put his image on us. He was telling them to give there money to earthly powers but their lives and their selfs fully unto God. We should never fail to remember God requires all of us, for he is the creator of us all.

Genesis 1:27