Multitudes, multitudes in the valley of decision! For the day of the LORD is near in the valley of decision. The sun and moon will grow dark, And the stars will diminish their brightness. The LORD also will roar from Zion, And utter His voice from Jerusalem; The heavens and earth will shake; But the LORD will be a shelter for His people, And the strength of the children of Israel. (vs14-16)
God comes in Judgment, but His people - those who followed Him - shall be safe. The reward is to everyone who repents, to the person who turns and obeys Jesus Christ. We can't be saved without Him, but we'll be saved WITH Him, and that makes all obedience and every spiritual sacrifice WORTH it in the end.
What will you do when Jesus comes? It will be TOO late to receive salvation and obedience then; it must be decided now on earth before that Day comes. And, the wisest thing imaginable is preparing your eternal soul by pleasing Him. This is like God's word to Noah: destruction comes assuredly, and salvation is assuredly in Christ. He said, “The end of all flesh has come before Me,for the earth is filled with violence through them; and behold, I will destroy them with the earth. Make yourself an ark of gopher wood; make rooms in the ark, and cover it inside and outside with pitch” (Gen 6:13-14). Like Noah's ark, this is something to be done by you. Salvation isn't something that takes place in heaven alone (by God's decree), but it actually impacts your conduct and thinking. Christ is teaching that those who obey Him - who build on the Rock of His word, and who die by His truth, denying themselves DAILY - will be saved in the end. He says, “If anyone desires to come after Me, let him deny himself, and take up his cross daily, and follow Me. For whoever desires to save his life will lose it, but whoever loses his life for My sake will save it” (Luke 9:23-24).
People now prepare for every calamity from global warming and climate change, to the 401K and planning for their grandchild’s future. Yet, this wise preparation for tomorrow is never GREATER than the care we have for ourselves spiritually. Peter said, “Therefore, brethren, be even more diligent to make your call and election sure, for if you do these things you will never stumble; for so an entrance will be supplied to you abundantly into the everlasting kingdom of our Lord and Savior Jesus Christ” (2 Pet 1:10-11).
People have misunderstood self-examination, thinking it leads to gloom if done too much, but it isn't so! Self-examination leads to peace, even as confession leads to Christ and grace, even as repentance leads to power from on high through forgiveness revealed. Paul wrote, “For godly sorrow produces repentance leading to salvation, not to be regretted; but the sorrow of the world produces death. For observe this very thing, that you sorrowed in a godly manner: What diligence it produced in you, what clearing of yourselves, what indignation, what fear, what vehement desire, what zeal, what vindication! In all things you proved yourselves to be clear in this matter (2 Cor 7:10-11). Observing my steps and examining my ways... changing my wrongs and doing works worthy of repentance... isn't dreary; it is EXACTLY the life we've been called to, and it keeps us trusting Christ, rather than saying that we believe while living in sin. Paul said, “Examine yourselves as to whether you are in the faith. Test yourselves. Do you not know yourselves, that Jesus Christ is in you? - unless you are disqualified. But I trust that you will know that we are not disqualified”, true preachers of truth (2 Cor 13:5-6).
Ultimately, the tree is judged by its fruit. What kind of Christian are you? Are you one who believes and practices gospel teaching, or are you wrong in heart and life? If you trust Jesus Christ with power, then you'll be rewarded with Christ in the end. He says, “Therefore we also pray always for you that our God would count you worthy of this calling, and fulfill all the good pleasure of His goodness and the work of faith with power, that the name of our Lord Jesus Christ may be glorified in you, and you in Him, according to the grace of our God and the Lord Jesus Christ” (2 Thess 1:11-12). Judgment Day will be a day of admiration for salvation in Christ, and you'll look upon Him amazed in love, rather than dreadful and in fear.
The gospel does the one thing needful; it prepares us to meet God. It promises PEACE and obedience as its fruit, as we rely on Christ. It secures us with promises of safety, if we spend our lives preparing. Noah moved with fear, reverence for Christ, and we serve the Lord in fear, rejoicing in trembling (Ps 2:11).