The bottom line is that if we could gain salvation, or lose salvation, then it was never grace at all. Anyone who does not teach eternal security is misinterpreting the Scriptures. Eternal security is a dispensation of grace doctrine only. It was not in affect under the law, or during the gospels, nor will it be in the coming Tribulation. It is for the church age only. Anyone who believes you can lose your salvation is getting it from passages that concern the nation of Israel and not the Body of Christ, i.e., the Old Testament, the Gospels, and the Hebrew Epistles. Paul never taught that one can lose their salvation. Yes, churches can fall from teaching grace by adding works as necessary for salvation, but an individual can never lose their salvation, period.