Salvation is a gift from God that cannot be taken away. When a person is saved, he is always saved. Nothing can separate him from eternal life in Christ and he can live with full assurance of Heaven as his future home.
"There is an excellent statement in these verses that shows our salvation is secure in Christ. There are multiple verses that express the same truth and they are based on other evidences. One in particular is Romans 8 where we find our security in Christ is based on the eternal electing grace of God. Before the world was created, God had already secured our eternal salvation because He chose us to it, and there is this golden chain of security bound up in three verses, Romans 8:28-30. We are guaranteed final salvation because God had a plan from before the foundation of the world. That is an excellent argument and many have said the argument of God’s eternal election is the real touchstone of security. We rejoice in God because that argument is so true. But in this section, there is another argument for our eternal security and the focus is the resurrection." (Excerpted from the sermon, Preservation because of the Resurrection)
Pastor V. Mark Smith