New Defender's Study Bible Notes
5:4 fallen from grace. Paul is not discussing the security of one’s salvation here, but rather the two different proposed ways of achieving salvation. If we propose to earn salvation by the works of the law, we thereby reject the free grace of Christ, and He is “cut off” from saving us. In this sense only can we fall from grace. We are both saved by grace and kept saved by grace. We cannot cancel the grace which gives salvation by failing to keep working for it, for works could never earn God’s grace in the first place.