I have not written to you because you don't know the truth, but because you know it, and because no lie is of the truth.

 In 2 Thessalonians 2:3-4, Paul speaks of "the man of sin," the one who exalts himself above all that is called God and all that is worshipped and who sets himself up in the very Temple of God. We do not know whom Paul was expecting, but again there is this thought of one who was the incarnation of everything which was opposed to God. 