In order to know why Jesus will come again, we have to look into what will happen at the time of his second coming.
1. Being set free from all illness
"Say to those with fearful hearts
Your God will come to save you
Then will the eyes of the blind be opened
Then will the lame leap like a deer
And the mute tongues shout for joy"(Isaiah 35:4-6).
"No one living in Zion will say I am ill and the sins of those who dwell there will be forgiven"(Isaiah 33:24).
"But our citizenship is in heaven and we eagerly await a Savior from there, the Lord Jesus Christ, who, by the power that enables him to bring everything under his control, will transform our lowly bodies so that they will be like his glorious body"(Philippians 3:20-21).
On the day when Jesus, Our Savior, will come again, the disabled person will be given unimpaired body and the sick a healthy body. Our bodies, vulnerable to sickness will be transformed into glorious bodies that will never be sick. Can there be anything more wonderful and more mysterious than this?
2. Resurrection of the dead
"For the Lord himself will come down from heaven, with a loud command, with the voice of the archangel and with the trumpet call of God, and the dead in Christ will rise first"(1 Thessalonians 4:16).
On the day of His second coming, the door of the tombs will be opened and those who have been asleep in faith in Jesus will come alive. Those mothers who have lamented their children's death will be able to embrace their lost children again and those lovers whose death has separated them for a long time will be rejoiced in reunion.
"Then we will sing a victorious song over death and shout Where, O death, is your sting?"(1 Corinthians 15:55).
We have overcome many difficulties in an effort to solve the problem of death but we will be able to overcome death forever when Jesus comes again. This is a profound mystery beyond our understanding. "Listen, I tell you a mystery; we will not all sleep, but we will be changed- in a flash, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, the dead will be raised imperishable, and we will be changed. Then the end will come. The last enemy to be destroyed is death"(1 Corinthians 15:51, 52, 24, 26).
3. Being raised to Heaven
"After that, we who are still alive and are left will be caught up together with them in the clouds to meet the Lord in the air"(1 Thessalonians 4:17).
This is the fulfillment of the promise given by Jesus to his disciples when he stayed on the earth. "Do not let your hearts be troubled. Trust in God; trust also in me. In my Father's house are many rooms if it were not for you. And if I go and prepare a place for you, I will come back and take you to be with me that you also may be where I am"(John 14:1-3).
Even though this age is the age of artificial satellites and spacecrafts, by which human beings have already conquered the moon and are said to explore Mars and other stars, this scientific technology cannot fulfill such a promise as that made by Jesus.
4. Receiving the due reward
"Behold I am coming soon! My reward is with me and I will give to everyone according to what he has done"(Revelation 22:12).
This is the word of Jesus, our Lord. The apostle Paul also said, "Now there is in store for me the crown of righteousness, which the Lord, the righteous Judge, will award to me on that day-and not only to me but also to all who have longed for his appearing"(2 Timothy 4:8).
But not all people will be rewarded. Matthew wrote about this, "When the Son of Man comes in his glory, and all the angels with him; he will sit on his throne in heavenly glory. All the nations will be gathered before him, and he will separate the people one from another as a shepherd separates the sheep from the goats... Then he will say to those on his left Depart from me, you who are cursed... into the eternal fire"(Matthew 25:31-41).
The good will be received in heaven and will have the joy of being crowned with the laurel wreath of righteousness, while the evil will have to experience grief. Enoch explained the reason as follows "See, the Lord is coming with thousands upon thousands of his holy ones to judge everyone, and to convict all the ungodly of all the ungodly acts they have done in the ungodly way, and of all the harsh words ungodly sinners have spoken against him"(Jude 1:14, 15).
The word, ungodly refers to those who do not respect and have no faith in God. It only results in the dreadful trial to have no faith that is to deny and to despise belief in God. "As it is written in the Bible, A man reaps what he sows"(Galatians 6:7). The evil man is caught in his own trap of sin and is destroyed by it.