It's simple. As I have said on other threads,here is a scenario that would HAVE to be true for a Christian to lose their salvation. God gives salvation, right? Sin is what would have to take it away. And,who wants you to sin?Satan, right? So if sin can take it away,and Satan is who wants you to sin, then Satan can take it away. If that is true, and it would HAVE to be to lose salvation, then Satan would be MORE powerful than God because Satan could take away what God gives you.This scenerio is definetely NOT true .One of my favorite verses to back my belief of never losing salvation is Galations 2:22 which states,"For I do not frustrate the grace the grace of God, for if righteousness come by the law, then Christ is dead in vain." Simply put ,if you could live good enough to get yourself into heaven, there was no reason for Christ to come and die.I hope this helped anyone who has a problem with believing once you are saved , you are saved forever. The reason for our lifestyles after salvation is two fold. First, to benefit us at the judgement seat of Christ. Second, to make believers out of others. NOT to keep ourselves saved.