2 not to be quickly shaken in your mind, and not be troubled, either by spirit, or by word, or by letter as if from us, saying that the day of Christ has already come.
The phrase “not to be quickly shaken in your mind, and not be troubled”refers to being worried or distressed about missing the participation of the rapture.
The phrase “either by spirit, or by word, or by letter as if from us”The word “spirit” indicates a deceiving spirit, demon. The deceiving spirit communicates through false teachers to get their message across to pull people away from the truth.
The church in Thessalonica got such a message. The message was to dismantle their faith by making them believe that Jesus left them behind.
Preterism is the belief that the event of the return of Jesus Christ has indeed already occurred. Their teaching is false, deceptive, and deadly. It will make you believe that there is no mark of the beast so, when it comes you will receive it.
5 “Who will you compare Me or make Me equal to? Who will you measure Me with, so that we should be like each other? 6 Those who pour out their bags of gold and weigh out silver on scales— they hire a goldsmith and he makes it into a god. Then they kneel and bow down to it. 7 They lift it to their shoulder and bear it along; they set it in its place, and there it stands; it does not budge from its place. They cry out to it but it doesn’t answer; it saves no one from his trouble.
In verse 5, it is clear that the Lord is against anyone making an idol that represents Him and an image that you believe have the same qualities of the true Living God. If you have done this and are praying to that image, know that you have made your own god.
Imagine your friend has a picture of you in his house. One day you decide to visit him to spend some time together and catch up. While you enter your friend’s house, you see that he has your picture on the wall. He starts to talk to the picture while you look on in bewilderment. Your friend continues to talk to your picture and completely disregards you while you wait for him to finish, so he can come over and talk directly to you. But, as he finishes talking to your picture, he goes to his room and sleeps.
My friends, that is a depiction of what happens when you pray to an idol in your house or a picture of Jesus hanging on your wall.
In the end, you did not pray to Jesus, you prayed to a demon.
1 Corinthians 10:14-21
14 Therefore, my dear friends, flee from idolatry. 15 I am speaking as to wise people. Judge for yourselves what I say. 16 The cup of blessing that we give thanks for, is it not a sharing in the blood of Christ? The bread that we break, is it not a sharing in the body of Christ? 17 Because there is one bread, we who are many are one body, for all of us share that one bread. 18 Look at the people of Israel. Do not those who eat the sacrifices participate in what is offered on the altar? 19 What am I saying then? That food offered to idols is anything, or that an idol is anything? 20 No, but I do say that what they sacrifice, they sacrifice to demons and not to God. I do not want you to participate with demons!21 You cannot drink the cup of the Lord and the cup of demons. You cannot share in the Lord’s table and the table of demons.
16 These are murmurers and complainers, walking after their lusts (and their mouth speaks proud things), showing respect of persons to gain advantage.
These false converts to Christ who are teaching false doctrine are never satisfied but are always seeking to have more. No wonder, only through Jesus Christ can a person be fulfilled and have true peace.
People without the Holy Spirit live only to feed their sinful cravings from a twisted imagination.
“their mouths utter arrogant words, flattering people for their own advantage.” The core of their thinking is pride, and they pretend to show others some good qualities [a mirage] for the intention of using it for their own advantage, revealing their true intent.