Which he got right from Paul-
The natural person has no room for the gifts of God’s Spirit; to him they are folly; he cannot recognise them, because their value can be assessed only in the Spirit. The spiritual person, on the other hand, can assess the value of everything, and that person’s value cannot be assessed by anybody else. For: who has ever known the mind of the Lord? Who has ever been his adviser? But we are those who have the mind of Christ. (1 Cor. 2:14-16)
Like it or not, Paul’s assertion that only those gifted with the Spirit understand the gifts of the Spirit is true. Dwelling outside the hermeneutical circle doesn’t mean one is a bad historian. But it does mean one is a terrible theologian and a worse exegete. All protestations to the contrary notwithstanding.