What I understood him to say was that Christ's life was insufficient to convince the universe that man can obey God's law, that the 144k is the final "proof" that man can keep God's law. Without the perfection of the 144k, the whole human race would be lost, including the faithful ones of old.

Yet Satan was not then destroyed. The angels did not even then understand all that was involved in the great controversy. The principles at stake were to be more fully revealed. And for the sake of man, Satan's existence must be continued. Man as well as angels must see the contrast between the Prince of light and the prince of darkness. He must choose whom he will serve. {DA 761.3}

By His life and His death, Christ proved that God's justice did not destroy His mercy, but that sin could be forgiven, and that the law is righteous, and can be perfectly obeyed. Satan's charges were refuted. God had given man unmistakable evidence of His love. {DA 762.4}

Another deception was now to be brought forward. Satan declared that mercy destroyed justice, that the death of Christ abrogated the Father's law. Had it been possible for the law to be changed or abrogated, then Christ need not have died. But to abrogate the law would be to immortalize transgression, and place the world under Satan's control. It was because the law was changeless, because man could be saved only through obedience to its precepts, that Jesus was lifted up on the cross. Yet the very means by which Christ established the law Satan represented as destroying it. Here will come the last conflict of the great controversy between Christ and Satan. {DA 762.5}

That the law which was spoken by God's own voice is faulty, that some specification has been set aside, is the claim which Satan now puts forward. It is the last great deception that he will bring upon the world. He needs not to assail the whole law; if he can lead men to disregard one precept, his purpose is gained. For "whosoever shall keep the whole law, and yet offend in one point, he is guilty of all." James 2:10. By consenting to break one precept, men are brought under Satan's power. By substituting human law for God's law, Satan will seek to control the world. This work is foretold in prophecy. Of the great apostate power which is the representative of Satan, it is declared, "He shall speak great words against the Most High, and shall wear out the saints of the Most High, and think to change times and laws: and they shall be given into his hand." Dan. 7:25. {DA 763.1}

Men will surely set up their laws to counterwork the laws of God. They will seek to compel the consciences of others, and in their zeal to enforce these laws they will oppress their fellow men. {DA 763.2}

The warfare against God's law, which was begun in heaven, will be continued until the end of time. Every man will be tested. Obedience or disobedience is the question to be decided by the whole world. All will be called to choose between the law of God and the laws of men. Here the dividing line will be drawn. There will be but two classes. Every character will be fully developed; and all will show whether they have chosen the side of loyalty or that of rebellion. {DA 763.3}

Then the end will come. God will vindicate His law and deliver His people. Satan and all who have joined him in rebellion will be cut off. Sin and sinners will perish, root and branch, (Mal. 4:1),--Satan the root, and his followers the branches. The word will be fulfilled to the prince of evil, "Because thou hast set thine heart as the heart of God; . . . I will destroy thee, O covering cherub, from the midst of the stones of fire. . . . Thou shalt be a terror, and never shalt thou be any more." Then "the wicked shall not be: yea, thou shalt diligently consider his place, and it shall not be;" "they shall be as though they had not been." Ezek. 28:6-19; Ps. 37:10; Obadiah 16. {DA 763.4}

If Jesus settled everything, if He disproved all of Satan’s lies and accusations, why, then, are we still here? Why aren’t we in heaven? Why isn’t Satan and sinners dead and gone? Why is God allowing the great controversy to continue?

If Jesus won the great controversy on the cross, or at His resurrection, why, then, is it still going on? What more must be proven in order for God to win great controversy, to destroy sin and sinners in the lake of fire, to restore paradise?

Sister White explains why the great controversy did not end at the cross. She gives two reasons: 1) Holy angels did not understand all that was involved in the great controversy, and 2) Satan changed tactics, his strategy.

It is the darkness of misapprehension of God that is enshrouding the world. Men are losing their knowledge of His character. It has been misunderstood and misinterpreted. At this time a message from God is to be proclaimed, a message illuminating in its influence and saving in its power. His character is to be made known. Into the darkness of the world is to be shed the light of His glory, the light of His goodness, mercy, and truth....

Those who wait for the Bridegroom's coming are to say to the people, "Behold your God." The last rays of merciful light, the last message of mercy to be given to the world, is a revelation of His character of love. (COL 415)

Not until the death of Christ was the character of Satan clearly revealed to the angels or to the unfallen worlds...

Satan saw that his disguise was torn away. His administration was laid open before the unfallen angels and before the heavenly universe. He had revealed himself as a murderer. By shedding the blood of the Son of God, he had uprooted himself from the sympathies of the heavenly beings.(DA 758, 761)

It was in order that the heavenly universe might see the conditions of the covenant of redemption that Christ bore the penalty in behalf of the human race. The throne of Justice must be eternally and forever made secure, even tho the race be wiped out, and another creation populate the earth. By the sacrifice Christ was about to make, all doubts would be forever settled, and the human race would be saved if they would return to their allegiance. Christ alone could restore honor to God’s government. The cross of Calvary would be looked upon by the unfallen worlds, by the heavenly universe, by Satanic agencies, by the fallen race, and every mouth would be stopped. (4ST 44)

Acts 4:10-12
10Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even by him doth this man stand here before you whole.

11This is the stone which was set at nought of you builders, which is become the head of the corner.

12Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.

Since rejecting the 1888 message, Adventism has not brought forth new light in almost a century. Worse, she has rejected and slid back from much Divine instruction.