Maybe Paul is not referring to all gospel truths by "the things of the Spirit of God" but to "the things" mentioned just previously in the run-up to v. 14 and not the message of salvation preached to the unsaved to which he contrasts "these things of the Spirit".
2 And so it was with me, brothers and sisters. When I came to you, I did not come with eloquence or human wisdom
as I proclaimed to you the testimony about God.[
a] 2 For I resolved to know
nothing while I was with you
except Jesus Christ and him crucified. 3 I came to you in weakness with great fear and trembling. 4
My message and my preaching were not with wise and persuasive words, but
with a demonstration of the Spirit’s power, 5 so that your faith might not rest on human wisdom, but on God’s power.
CONTRASTED TO _
1 Cor. 2:6-
We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing. 7 No, we declare God’s wisdom, a mystery that has been hidden and that God destined for our glory before time began. 8 None of the rulers of this age understood it, for if they had, they would not have crucified the Lord of glory. 9 However, as it is written:
“What no eye has seen,
what no ear has heard,
and what no human mind has conceived”[
b]—
the things God has prepared
for those who love him—
10 t
hese are the things God has revealed to us by his Spirit.
The Spirit searches all
things, even the deep things of God. 11 For who knows a person’s thoughts except their own spirit within them? In the same way no one knows
the thoughts of God except
the Spirit of God. 12 What we have received is not the spirit of the world, but the Spirit who is from God, so that we may understand
what God has freely given us. 13 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.[
c]