Thats an interesting verse, I have seen atheists say that just to mock the verse, so I don't know how I feel about it. Ive always wondered about it, but back then saying Jesus is Lord meant trouble, nowadays nothing will happen to you if you say it, (in the western world that is)
Its true that wicked men love darkness and have a stony heart, but lets also remember that God's grace has appeared unto all men as per Titus 2:11. Jesus died for all men and the gospel goes out to all men. And the gospel is the power of God, and when presented with God's grace we can reject it or accept it.
2 Corinthians 5:20-21
Now then, we are ambassadors for Christ, as though God were pleading through us: we implore you on Christ’s behalf, be reconciled to God. For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him.
We implore you on Christ's behalf, BE RECONCILED! This is a meaningless statement if there is no mind of man involved. Remember that repentance is just that, to turn, to change ones mind.