Well, for one thing, you're misapplying the verses you're quoting. Paul is not describing classes of truth, as if there were such a thing. Paul is describing classes of things: spiritual and carnal; or eternal and temporal; or heavenly and earthly.
And the phrase from the translation you're is using is 'spiritual thoughts,' or 'concepts,' not 'spiritual truth.'
I think the NIV captured the sense better:
This is what we speak, not in words taught us by human wisdom but in words taught by the Spirit, explaining spiritual realities with Spirit-taught words.
There is no varying class of truth. There is only truth. There are spiritual truths, meaning there are truths about spiritual, or eternal, things. It is no more true that Jesus is the Son of God, than it is that Isaac was the son of Abraham. One is an eternal reality, and the other was temporal.
All that Paul is saying is that they use inspired speech ( i.e. Moses and the prophets as well as the revelations the Apostles themselves received, and that we now have in our Bibles ) to teach the spiritual realities of the Gospel, beginning with the "message of the Cross," 1 Corinthians 1:18 , which is foolishness to those who are carnal, and a message that requires faith to receive.
What is the message of the Cross? (and what is the Baptist message?) That Christ died in our stead. This is indeed foolishness to the wisdom of the world. What? "God is a child-abuser!" they shout.
But you've gone off the rails with this passage in the style of Kenneth Copeland and others with the notion that you can have a knowledge of a supposedly higher, or a more true truth than that revealed in the Scriptures.
[edited to add] LOL and now you're calling everyone who is reprooving you tares among the wheat.