Calvinists believe in Irresistible Grace which is a specific Grace God works in those
purposed for salvation from before the world began. We believe that God
appointed a time, within the timeline of creation, where the Holy Spirit would regenerate those purposed individuals such that they no longer perceive Christ crucified as foolishness but perceive him as the irresistible wisdom and power of God for salvation. Because of God’s gracious gift of change in perception Christ has become to
us the Power that motivates us to endure to the end so as to be saved and inherit eternal life. Those purposed for salvation are acting out what God is working in them. This is how God saves his purposed people from beginning to end.
Provisionists also believe in a kind of an “irresistible point” but they can not exactly call it “Grace” because it is not a specific act of God but an act of man, on himself, in response to what God has graciously provided. Once they respond by bring themselves to “the choice” they are
eventually rewarded with something they have conveniently named “regeneration” but they are not clear on its actual function.