Paul says he was caught up to the third heaven and receive revelations of “surpassing greatness.” Paul reports this vision in a way consistent with other visions of heaven in the literature of the Second Temple period.
Like other prophets, Paul is “caught up” into the third heaven. He uses the same verb as 1 Thess 4:17, ἁρπάζω. This word has the sense of being snatched away and appears in the LXX in Gen In both cases the verb is passive, as expected in a vision report. In 1 Enoch 39:3 a whirlwind catches the prophet up and takes him into the “ultimate ends of heaven” where he sees the dwelling places of the holy ones.
2 Enoch 8.1-3 And those men took me from there, and they brought me up to the third heaven, and set me down there. Then I looked downward, and I saw Paradise. And that place is inconceivably pleasant. And I saw the trees in full flower. And their fruits were ripe and pleasant-smelling, with every food in yield and giving off profusely a pleasant fragrance. And in the midst (of them was) the tree of life, at that place where the LORD takes a rest when he goes into paradise. And that tree is indescribable for pleasantness and fine fragrance, and more beautiful than any (other) created thing that exists.
In Paul’s vision, he heard “inexpressible words” (ἄρρητα ῥήματα). This may mean they cannot be spoken in human language (something like Spock’s real name?). But this might mean Paul was not given permission to report what he heard while he was in heaven. This second option is a common feature of heavenly vision reports, some things are so great the seer holds them back from people who are not ready to hear them. In Daniel 12:4 the prophet is told to “seal up the prophecy” and Revelation 14:3 John hears seven thunders but is not permitted to report what they said.
Even though Paul has had a visionary experience on a par with his opponents in Corinth, he chose not to mention it since it has no value for the church at all! Why should he boast in some spiritual experience they can never have? What spiritual benefit could possibly come from Paul telling them the details of the vision?