It is finished.
Words with such finality, yet full of comfort.
Throughout the book of John Jesus says that His time is not complete yet (John 2:4; 7:6; etc.). He still has work to do. However, on the cross He says that His work is complete. He has finished what He came to do.
I also think back two chapters to the prayer of Jesus in John 17. Jesus said that the time had come for God to glorify the Son so that He could glorify the Father. Part of Jesus work was done. He said that He had completed the task that God had given Him. Obviously not everything was complete at that point because Jesus had not died. But each step of the way Jesus was completing the tasks God had given Him.
On the cross Jesus says that the work He was sent to do was complete. The sin debt had been paid. He had done His work of reconciling man to God. He fulfilled the law in His life and opened a way that we could have access to God through Him. What a glorious statement: It is finished!
While His work of redemption is complete, I am also thankful to know that He still has plans. We can read the Scriptures and see that He has a future planned for us and that because of His work on Calvary, we can have an eternal future with Him.