But, doesn't even that statement presume that God's revelation of himself isn't in itself gracious and sufficient to accomplish its intent to "reveal?"
Yes, this is my problem with Calvinism, I believe it denies the power of God.
Rom 1:16 For I am not ashamed of
the gospel of Christ:
for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
The gospel itself is all that is needed to enable any man who hears it to believe. It is the message it conveys, the understanding it gives a man who otherwise would be ignorant of how to be saved.
Calvinism denies that the gospel has power, they believe that a man must be supernaturally regenerated before the gospel can have any effect on a man.
2 Tim 3:5 Having a form of godliness,
but denying the power thereof: from such turn away.
The gospel alone is all that is needed to ccnvert men. By the gospel men are not only enlightened to have knowledge so that they can believe, but they are drawn by the message of love that God loved us even while we were sinners and sent his Son Jesus to die for our sins and rise to life again.
That is not good enough for Calvinism, to them a man is a spiritual corpse that cannot hear or respond to the gospel. But Jesus said the dead can hear his voice, and those that hear (believe) shall live.
We see this in the same chapter of 2 Timothy 3;
2 Tim 3:15 And that from a child thou hast known
the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus.
Natural man is ignorant and cannot possibly know of Jesus and the salvation he offers absent the word of God. It is the knowledge the word of God provides that enables a man to believe, and the drawing power of his message of love.
But there is no extra power needed, the gospel alone is enough to enable any man to believe if he will choose to do so.