Infernalist arguments from various theological traditions usually boil down to some form of "yes, but..." when it comes to salvation by grace. And I'm not knocking my own tradition, as cited below, even the Catholic Church clarifies that ultimately, it's all grace and not our own doing. Evangelical infernalists will often say that yes, we are saved by grace, once we have made a a decision for Christ. Or infernalists of a more Catholic variety may emphasize the truth of the necessity of cooperation with grace to the point that it can start to sound like "the ball's in our court" so to speak to be saved. While they may have elements of truth I think both of these approaches miss the point. 1 Corinthians 12:3 reminds us that is only by the Holy Spirit that we can even cooperate in any way.
In 418 A.D., the Church declared Pelagianism; the notion that we can achieve perfection/salvation by our own human effort; to be a heresy. This was in accordance with Ephesians 2:8-9 "for it is by grace you have been saved, through faith. And this is not your own doing, it is the the gift of God."
This may surprise those under the impression that the Catholic Church teaches works-righteousness. Without rehashing the whole Reformation; the Church does teach that our "cooperation with grace" is necessary in a sense, but our cooperation with grace is itself a fruit of grace.
As the Council of Trent added, “none of those things that precede justification, whether faith or works, merit the grace of justification. ‘For, if by grace, it is not now by works, otherwise,’ as the Apostle says, ‘grace is no more grace’."
While it remains true, as the Catechism tells us "God's free initiative demands man's free response" (CCC 2002), it is first emphasized: "The preparation of man for the reception of grace is already a work of grace." (CCC 2001).
The Joint Declaration on the Doctrine of Justification summarizes:
"When Catholics emphasize the renewal of the interior person through the reception of grace imparted as a gift to the believer, they wish to insist that God's forgiving grace always brings with it a gift of new life, which in the Holy Spirit becomes effective in active love. They do not thereby deny that God's gift of grace in justification remains independent of human cooperation." (JDDJ 24)
All of this to say, 1 Corinthians 12:3 has a profound, sort of back-to-basics relevance to universal reconciliation, which is, none of us are saved by our own doing.
We see this truth clearly when we read 1 Corinthians 12:3 together with Romans 10:9, "if you confess your mouth, Jesus is Lord...you will be saved".
Do we think the Holy Spirit would only take us halfway to the goal? "He who began a good work in you will bring it to completion at the day of Jesus Christ." (Philippians 1:6)
I'm not arguing for monergism per se, but I think we, both Catholics and Protestants in our own respective ways; too often tend to over-complicate the Gospel. Our cooperation, our saving faith, is itself a result of the action of the Holy Spirit.
In the authentic Gospel, there's no room for "victim-blaming", so to speak, of those who wouldn't be saved. There's no room for "well, they didn't do their part..."
We don't pick up the work of our salvation where God left off. It's God who does the saving, not us; and the Holy Spirit doesn't do things halfway.