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That’s the message of the gospel: the work of salvation is completed. It is finished. There’s nothing we can add to it, and to add to it would mean taking away from it. God offers the lost world a finished work, a completed salvation. All the sinner has to do is believe on Jesus Christ. The Book of Hebrews explains this completed salvation: “But now, once at the end of the ages, He has appeared to put away sin by the sacrifice of Himself. And as it is appointed for men to die once, but after this the judgment, so Christ was offered once to bear the sins of many” (Heb. 9:26–28). “For it is not possible that the blood of bulls and goats could take away sins.… But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of God.…” (Heb. 10:4, 12). The work of salvation is completed. “It is finished!” Our Lord died, was buried, arose from the dead, and returned to glory. There he sat down because the work was finished (Heb. 1:3). In the Old Testament tabernacle, there were no chairs because the priests’ work was never finished. But Jesus Christ sat down in heaven because his work was finished. Since salvation is a finished work, we dare not add anything to it, take anything from it, or substitute anything for it. There is only one way of salvation: personal faith in the finished work of the Lord Jesus Christ. When my Lord died, he cried, “Tetelestai! It is finished!” It was a familiar word shouted by a faithful Savior about a finished work. It has well been said that Jesus didn’t make the “down payment” on the cross and then expect us to keep up the installments. Salvation isn’t on the installment plan. Jesus paid it all, and that means that redemption is a finished work. Lifted up was He to die, “It is finished” was His cry; Now in heav’n exalted high, Hallelujah, what a Savior! (Philip P. Bliss) Is he your Savior? He can be if you will accept his finished work on the cross, make it personal (“Christ died for my sins”), and ask Jesus to save you. “For whoever calls upon the name of the LORD shall be saved” (Joel 2:32; Acts 2:21; Rom. 10:13).
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Warren W. Wiersbe (The Cross of Jesus: What His Words from Calvary Mean for Us)