The 6th word of Christ from the Cross is one word in Greek: “Tetelestai” from the root telos or end point. In John 19:28 it is translated, “After this, when Jesus knew that all things were now completed, in order that the scripture might be fulfilled, he said, ‘I thirst.’” In v. 30 the word appears again, this time on his lips: “When he received the sour wine Jesus said, ‘It is finished,’ and he bowed his head and gave up his spirit.” The word tetelestai was also written on business documents in New Testament times to indicate that a bill had been paid in full!
What is finished?
“I have finished the work you sent me to do.” (Jesus’ prayer to the Father, John 17)
It’s the once for all sacrifice for the sins of the world, to which nothing can be added! “…He has appeared once for all at the end of the ages to put away sin by the sacrifice of himself.” (Hebrews 9:26)
As Bill Hybels has put it succenctly:
Religion is spelled D.O.
Christianity is spelled D.O.N.E.
The work of redemption is Finished! This the Good News we announce.