Ok, one last time. Let's look at the context:
1 When I came to you, brothers, announcing the testimony of God to you, I did not come with brilliance of speech or wisdom. 2 For I determined to know nothing among you except Jesus Christ and Him crucified. 3 And I was with you in weakness, in fear, and in much trembling. 4 My speech and my proclamation were not with persuasive words of wisdom, but with a demonstration of the Spirit and power, 5 so that your faith might not be based on men's wisdom but on God's power.
6 However, among the mature we do speak a wisdom, but not a wisdom of this age, or of the rulers of this age, who are coming to nothing. 7 On the contrary, we speak God's hidden wisdom in a mystery, which God predestined before the ages for our glory. 8 None of the rulers of this age knew it, for if they had known it, they would not have crucified the Lord of glory. 9 But as it is written: What no eye has seen and no ear has heard, and what has never come into a man's heart, is what God has prepared for those who love Him. 10 Now God has revealed them to us by the Spirit, for the Spirit searches everything, even the deep things of God.
In verses 1-5 it is true that Paul is speaking about his first coming to them preach the gospel with the Holy Spirit speaking through him. And it actually speaks of their faith, which was not based upon mere human testimony but on the testimony of the HS within Paul, in other words, his message was inspired from above, not from human wisdom and persuasivness.
But please notice his transistion from the "elementary" truths of their faith to speaking to the "mature" about the "secret wisdom" and "deep things of God."
I know what you are going to say. "Christ and him crucified" was contained within this "secret wisdom" and the "deep things of God." Right?
Afterall the scripture goes on to say: " What no eye has seen and no ear has heard, and what has never come into a man's heart, is what God has prepared for those who love Him. "
No one has seen it or heard it! Until now. Paul, by the power of the Holy Spirit, was revealing it to them. The mystery was being revealed by the Holy Spirit through the inspired preaching of God's divinly chosen apostles.
Those who heard it could combine it with faith and receive the promised Holy Spirit (Gal. 3:14) or they could resist the Holy Spirit (Acts 7:51) and continue in sinful rebellion.
If they are like Paul's audience in 1 Cor. they apparently had faith. We say "apparently" because this passage doesn't specifcally link their recieving of the Spirit to faith as other passages do, but it is alluded to in verse 5. There "faith" was based upon the power of the Holy Spirit through Paul's message of the gospel.
You see, you are assuming that Paul is speaking about the Spirit's work on the "natural man" directly and indepedantly of Paul. I see it as the Holy Spirit empowering Paul to speak truth so that the natural man can hear the truth, which can only be revealed by the Spirit, and decide for themselves if they will believe it to be true.
"You have seen me and believed, but blessed are they who don't see me and yet believe."
I guess Thomas needed more evidence. Funny, if he were effectually called to salvation in the way Calvinist teach why did Jesus have to provide the evidence?