Systematic Theology: An Introduction to Biblical Doctrine

by Wayne Grudem

in all of the passages where continuing to believe in Christ to the end of our lives is mentioned as one indication of genuine faith, the purpose is never to make those who are presently trusting in Christ worry that some time in the future they might fall away (and we should never use these passages that way either, for that would be to give wrongful cause for worry in a way that Scripture does not intend). Rather, the purpose is always to warn those who are thinking of falling away or have fallen away that if they do this it is a strong indication that they were never saved in the first place. Thus, the necessity for continuing in faith should just be used as a warning against falling away, a warning that those who fall away give evidence that their faith was never real.