not to be easily upset or disturbed by people who claim that the Lord has already come. They may say that they heard this directly from the Holy Spirit, or from someone else, or even that they read it in one of our letters.
The day of the Lord's return will surprise us like a thief. The heavens will disappear with a loud noise, and the heat will melt the whole universe. Then the earth and everything on it will be seen for what they are.
Remember that Christ says, "When I come, it will surprise you like a thief! But God will bless you, if you are awake and ready. Then you won't have to walk around naked and be ashamed."
Remember the teaching that you were given and that you heard. Hold firmly to it and turn from your sins. If you don't wake up, I will come when you least expect it, just as a thief does.