Predestination - The vast majority of the most respected theologians believe in it. There's also some very respected theologians who don't. Its not a heaven or hell issue. Based on MY experience, and the experience of all (true) Christians I know, I had absolutely nothing to do with my salvation.
When one comes to the conclusion that they had nothing to do with their salvation, there is the deepest sense of gratitude and duty. Its a very humbling perspective, quite the opposite of the perception of the critics, that predestination leads to a careless attitude. It was a stunning paradigm shift when it happened to me.
