Here is the shortest and best argument (in my opinion) for Universalism: God either a) knew before He created the universe that some would be eternally damned, or b) He did not know. If a), then why would a God of self-sacrificing love create the souls He knew would be lost? If b) then how could He ever give up in trying to save them? The common rebuttal to a) is that He wanted to display His 'justice'. I find this very hard to square with the actions of the greatest conceivable being, or the essence of Christ as found on the cross. It seems to make God the ultimate user of people to promote his own ends. Also, if this is true, it means God cannot be love. For love is described in 1 Cor 13. You must, then, go about redefining love and emptying of its meaning if you're to hold that God intentionally created some knowing they would be lost. The common rebuttal to b) is that there comes a point where the creature is 'metaphysically built' into a state of ultimate evil. But, given the understanding of evil as privation, is it not impossible to ever reach a state of absolute evil? And if it is not absolute, then there is some good, some 'potentiality towards good creaturely becoming', is there not?