Then the lawless one will be revealed, whom the Lord will kill with the breath of his mouth, and bring to nothing by the brightness of his coming;
Now there were some there who said this persecution that we are going through is the Great Tribulation; this is the day of God's vengeance. It is already here. And they even produced letters, supposedly written by Paul, saying yes, these fellows are right; this is the day of vengeance. This is the Great Tribulation. And so Paul is writing to correct this. Don't believe any supposed letters from me.At the end of this epistle Paul makes the note that, "I have signed this in my own hand which I do with all of my epistles". These false epistles that they had been receiving weren't signed by Paul's own hand, and so he makes reference to the fact that he personally signs those epistles that he writes. It is a mark of Paul's. Though he dictated and someone else wrote them, he would sign his name to the end that they might have the authority and know that it was indeed from Paul.So don't be troubled in your spirits, by someone's word, or by a letter that was supposedly from us, in believing that the day of the Lord is already present, or is now present.