1 Cor 2:14 doesn't say the unregenerated/worldly man can't repent. It's saying the interest of the worldly man is of the pleasures of this world, he doesn't care about the wisdom of God. If the ungodly man get convicted and repents he will receive the Holy Spirit as a gift by grace.
I'm getting a clearer picture now of what you mean.
First of all, let me point out that Paul is talking about more than just "interest" and "not caring" in
1 Corinthians 2:14, he us talking about
inability--does not, cannot, is foolishness to him.
And I note that conviction is a work of the Holy Spirit, not man, correct?
And it seems to me repentance is all part of the package of conviction, right?
And who is the source of all that--the Holy Spirit, not man.
I think what Calvin is saying is that without the work of the Holy Spirit
within one, which is only by the new birth, there would be no conviction and repentance, for Jesus says you can't even
see the kingdom of God unless you are born again (
John 3:3), and repentance is much more than just
seeing the kingdom of God, it is the faith of
entering the kingdom of God, and Jesus also makes clear that rebirth by the Holy Spirit is a totally sovereign gift of God (
John 3:8), depending on nothing but "whatever God pleases," no?