Jesus' last word is our first word. "Tetelestai - It is finished". When He died, our life began. And because "it is finished", there is nothing that any one of us can contribute to His work on the cross to bring us any closer to salvation.
Tetelestai- translation: it is finished. On the cross just before Jesus died he said it is finished. In those times the word tetelestai was stamped onto Any depts that had been paid off. Therefore Jesus said that our debts are paid.