By Universalism I mean the position that all are eventually saved; in other words, that the population of Hell will be zero.
Edward Feser has had several back and forths with David Bentley Hart on the issue. My point here is not to enter the debate between Feser and Hart but to consider Universalism from a different perspective.
Let us suppose that Universalism is true, and that we know it is true. Then we know that everyone will eventually enjoy eternal bliss; in particular, I will eventually enjoy eternal bliss no matter what I do on this Earth. For me, at least, this is a very dangerous thing to believe, for I am always looking for reasons to remain in my sins, which I find quite comfortable even if I know intellectually that they are essentially bad for me.
I almost wrote "ultimately" bad for me, but that isn't quite right if universalism is true, for in that case no sin is ultimately bad for me, since I will ultimately enjoy eternal bliss. But even if that is ultimately true, it is nonetheless true that I know I would be objectively happier if I were not sinning rather than sinning.
There is no hurry, though, is there, if universalism is true? I might be more perfectly happy if I shed some of my sins, but I am not unhappy and in fact I'm quite comfortable as I am. So why stress out about confronting and conquering sin? Christ in the New Testament exhorts us to deny ourselves, take up our cross daily, and follow him. That's nice advice for someone with ambitions to be a saint, but I have no such ambitions. If I'm ultimately destined for eternal bliss, why go through all the hassle? As the Five Man Electrical Band sang - "Thank you Lord for thinkin' bout me, I'm alive and doin fine."
Sure, I might have to go through some pain in the next life before experiencing that eternal bliss, but that's all a little vague compared to the very real suffering and inconvenience involved with confronting sin in this life. I've never been one to seek out the hard road when the easy road is available - especially when I'm assured they both end up in the same place.
These points are not meant to be rhetorical or flip. I abandoned the Catholic faith after high school because I found it entirely irrelevant to my life. The upshot of my 70's Catholic education was that sin wasn't really a big deal, Jesus wanted to be my friend, and he was always willing to forgive anything - which, I presumed, would include ignoring him. So why not get on with the business of this world and then get back to Jesus sometime later?
It was only later when I began to understand that my Catholic "education" was no education at all that I began to rethink things. For me, the reality of sin and its eternal implications is the only reason to take Christianity seriously in the first place. If universalism is true, then sin is not (in Kierkegaard's terms) "eternally decisive." Neither is our relationship to Christ in this life decisive. Follow him, reject him, ignore him, twice-a-year Catholic him, what does it matter? Ultimately, it won't.
I wonder if there is a mode of existence in hell that is universalist (this is NOT to claim that anyone believing in universalism is going to hell). But if universalism implies that there are no decisive eternal implications for a lack of a relationship with Christ in this life, why not in the next? Perhaps there are individuals in hell who recognize their sins but are comfortable in them, and tell themselves they will repent tomorrow, with tomorrow (naturally) never arriving. Maybe C.S. Lewis treated this idea in The Great Divorce. It's been a long time since I read that book.
I'm in danger of being one of those eternally procrastinating guys - which is why I find the idea of universalism a temptation to be rejected.