Eternal Security has always been a controversial subject for Christians. There are two sides to this debate. One says, once you are saved you can never lose your salvation, no matter what you do. In other words, your eternity is secure in heaven (eternal security). The other side says salvation can be lost by what you choose to do after receiving it. In other words, a once-saved person can spend eternity in hell, depending on how they live their life after receiving salvation. I studied this topic, using the Bible alone, to prove one simple theory: It has always been God's intent that we must work to keep our salvation and we can lose it by what we do.