Let's examine this verse. Those who believe once-saved-always-saved believe it so strongly that they see it as a necessary belief in order to truly enjoy your salvation. This is definitely a perilous time.
http://faithrootedorganizing.net/brakshoe2018/2018/04/11/the-scandal-that-happens-in/ This should not be construed to mean that every time we sin or experience a crisis in our faith, we have lost our salvation. However, these verses complement each other. It doesn't happen that easily.
http://thrustpad2018.blogghy.com/ The Spirit of God is the input, and the works are the output. If your works don't reflect a godly conscience, don't focus on improving the works, rather, work on the heart. If we do not live a godly lifestyle, we may not truly be born again.
http://www.apsense.com/abc/brakelining Those who don't believe it see it as a dangerous teaching that provides a false sense of security.
http://slidebearing.page.tl/ In many instances, someone has been saved for a period of time, but then fallen away.
God's focus is on the heart, much more than on the external behavior (1 Samuel 16:7). The blood of Jesus does that. But emotions should never be mistaken for a true salvation experience, which can best be measured by the repentance that happens afterwards.