4:5 one faith. All people, even atheists, have faith in something. The Christian faith, however, is the only saving faith (Ephesians 2:8). It is an understanding faith (Hebrews 11:3), a justifying faith (Romans 5:1), a purifying faith (Acts 15:9), a living faith (Galatians 3:11), a stable faith (II Corinthians 1:24), and a triumphant faith (I John 5:4). But this true faith may be rare on earth when Christ returns (see note on Luke 18:8).