I don’t know what kind of mood Paul was in when he wrote his second letter to the Thessalonians, but it is remarkable how many grammatical incongruities there are.
Read, for example, 2 Thess 2:7. Paul writes, τὸ γὰρ μυστήριον ἤδη ἐνεργεῖται τῆς ἀνομίας· μόνον ὁ κατέχων ἄρτι ἕως ἐκ μέσου γένηται. He has just said that something (τὸ κατέχον) — and will later say someone (ὁ κατέχων) — is restraining the coming of the antichrist. However, despite this restraint, the mystery of lawlessness (τὸ μυστήριον τῆς ἀνομίας) is already at work (ἤδη ἐνεργεῖται), a mystery that will some day (ἐν τῷ ἑαυτοῦ καιρῷ) give way to the obvious truth of who is behind the evil of our day.