Read: John 19:28-30
Most Christians begin well, but finishing well is entirely another matter. Jesus was a finisher. He completed the work of redemption that He came to accomplish. He left nothing undone. In the last hours of His earthly life, He could pray to His Father, “I have glorified You on the earth. I have finished the work which You have given Me to do” (John 17:4). In John 19:30, He said, “It is finished.”
John Flavel says, “Did Christ finish His work? How dangerous it is to join anything of our own to the righteousness of Christ, in pursuit of justification before God! Jesus Christ will never endure this; it reflects upon His work dishonourably. He will be all, or none, in our justification. If He has finished the work, what need is there of our additions? And if not, to what purpose are they? Can we finish that which Christ Himself could not complete? Did He finish the work, and will He ever divide the glory and praise of it with us? No, no; Christ is no half-Saviour. It is a hard thing to bring proud hearts to rest upon Christ for righteousness. God humbles the proud by calling sinners wholly from their own righteousness to Christ for their justification.”
Rest in the fact that Christ’s work on the cross was perfectly perfect and no one can add anything to it. If you also are led by the Spirit to think like apostle Paul, pray to God – “I may know Him and the power of His resurrection, and the fellowship of His sufferings, being conformed to His death…I do not count myself to have apprehended; but one thing I do, forgetting those things which are behind and reaching forward to those things which are ahead, I press toward the goal for the prize of the upward call of God in Christ Jesus” (Phil. 3:10,13-14).