There are some arguments that suggest that universal salvation is a thing.
For example, does it make sense for God to create a man who is essentially impervious to grace? The Holy Spirit searches his heart, again and again, predicts that the appropriate grace would be rejected, therefore abstains from futilely giving it in the first place, and so leaves him alone his entire life. So, the man never learns to love. Upon his death, God examines him, realizes that it’s not the case that if he were surrounded by more fortuitous circumstances, then he would in fact flourish (so he was just unlucky and still has a chance), as a result finds him completely useless, and throws him into hell.
What would be the point? To positively reprobate anyone like this? Who benefits from the creation of a man from the beginning inevitably predestined to hell?
And yet we do not know God’s purposes. Just as an example, maybe God foresees that this condemned man will beget a son who will be great in His sight and convert many people. The man is sacrificed for a greater good that could not be brought about at a smaller cost. Suppose further that the son will actually convert 100 men. Moreover, these men are almost as “transcircumstantially depraved,” in William Lane Craig’s phrase, as the man but not 100%, such that the only way in which they could be and in fact would be saved is through the actions of the son. Losing 1 is then a price of gaining 100. As long as this is even a possibility, universal salvation remains unproven. Moreover, with the amount of tragedies occurring daily in people’s lives, and the fact that the angels do weep for our sins, the problem becomes so much murkier. It is indisputable that we lose people. Children die horribly in wars. I don’t know what becomes of them.
I do not believe that universal salvation can be demonstrated by reason; nor moreover is it an article of faith. Nor, finally, is it a proper object of hope, because it may not be true, and it is blasphemy to hope that the omniscient God had created “better” than He did.
Each of us should seek to save as many people as he can, and rest with that.