If I were to die today, how do I know that the sins that I haven't repented from are forgiven? And are there opinions on the types of sins that may keep us from Heaven if unrepented? Jealousy versus murder. I know those are two extremes, but the question came up when talking with my friend. He is a Christian and knows that having an affair is wrong, however he doesn't want to stop. But, he is also concerned about his salvation. I tried to explain that if we have a repentant heart towards God with our actions, that is really important. If we know what God is telling us and actively sinning without remorse or care to repent, is that different than just a sin that we fall into out of weakness? I honestly didn't know what to tell him though about him having an affair....and what if something were to happen to him....how would God view that sin when it comes to him going to heaven or hell?