In 2 Thessalonians, Paul addresses the issue regarding that the day of the coming of Christ has already come. He urges them to not to become alarmed or unsettled by the teaching from him, concerning this issue. He warns them that others will try to deceive them into believing that day already came, and he talks about how God will not come until “the rebellion occurs and the man of lawlessness is revealed, the man doomed to destruction” (vs 3). Paul tells how when Jesus comes, he will put himself above everyone and everything that is worshipped so that he will prove himself to be God. In addition, Paul talks about how the lawless one will be revealed at the proper time, which has not happened yet. When Jesus does come, the lawless one is to be revealed “whom the Lord Jesus will overthrow with the breath of his mouth and destroy by the splendor of his coming” (vs 8). Following this, Paul tells about how the lawless one deceives the people who are perishing into believing lies and wickedness. He says they perish because they “refused to love the truth and be saved” (vs 10). This reason in particular is what causes God to send a delusion into their minds so that all who did not believe will be condemned.
In 1 Thessalonians 4:13-17, Paul explains how people should have hope and not grieve over those who are sleeping in death, like the rest of mankind does. In chapter 5:2-3, he begins to talk about how there will be times of destruction in the end, when Jesus comes. He says that there will be judgement and pain, even when people are crying out for peace. In verse 23, Paul strongly urges people, “May your whole spirit, soul, and body be kept blameless at the coming of our Lord Jesus Christ.” He is trying to tell them how important it is to stay true to God’s word and continue living a holy life, so that they can be presentable to Jesus the day that he comes. In the 1 Corinthians passages, Paul strongly encourages people to make every moment to be lived for God and God alone; to glorify him in everything they do and that worldly things don’t last. In Romans, he explains how the day of Jesus’ coming is nearer than people think. He instructs for people to wake up from their sleep and foolish ways, and start making every moment of their lives count for God.
During this time, after Paul had left the church in Thessalonica, people had been dying from the church which brought much sorrow and loss of hope. They had it in their minds that Jesus was supposed to return before any of them died, but he had not returned. This caused people to doubt Paul and believe he was mistaken, which lead Paul to the writing of 1 Thessalonians, in which he addressed how the coming of the Lord was in the future and that they should not give up their hope. What caused Paul to write the second letter (2 Thessalonians) was that people listened and believed the first one so much that they stopped making any plans for the future, which caused people to quit their jobs and duties.