That ye be not quickly tossed from your mind, nor be put in alarm - either by spirit, or by discourse, or by letter as by us, as that the day of the Lord, hath set in:

Who puts himself against all authority, lifting himself up over all which is named God or is given worship; so that he takes his seat in the Temple of God, putting himself forward as God.

And then will come the revelation of that evil one, whom the Lord Jesus will put to death with the breath of his mouth, and give to destruction by the revelation of his coming;

And for this cause, God will give them up to the power of deceit and they will put their faith in what is false:

But if anyone does not obey our message through this letter, take note not to associate with him, in order that he may be put to shame.

You are not to treat him as an enemy, but to put him under discipline, as a brother.