When we entrust our life to the Lord, He works the gift of salvation through us. That gift will be fulfilled when Jesus takes us to be with Him for eternity.--The words 'start' and 'complete' are words used of sacrifices in the Old Testament. A ritual of starting and ending were important. God started with providing the sacrifice that made us whole. But through faithful lives lived for Him, God finishes the sacrifice He began at the cross ending when Jesus comes again.