For the record, I do not believe in "active reprobation". This is the doctrine that God actively prevents people from believing that would otherwise believe. I am not offended by that doctrine, but I do not find it fully supported by scripture. So let's talk about what the Bible actually means when it says that God hardens people's hearts. Most reformed/calvinistic people such as myself believe that the way the God hardens is by simply allowing sinners to go on in their sinful ways, adding sin to sin in their rebellious hearts. I think even non-calvinistic people can agree to that definition. Now, if we can all agree that, in fact, God hardens hearts, then can we all agree that conversly God softens hearts. And if God softens hearts, why does he not soften all hearts?