1 John 5:13 assures us that we may know for certain that we have experienced true salvation and will one day go to heaven. This passage, along with the remainder of 1 John, declares the marks of a Christian. First, a genuine Christian believes that Jesus is the Christ, the Son of God, the savior of the world. Next, a believer will show progress (not perfection) toward an obedient lifestyle of holiness. Finally, Christians love one another sacrificially and humbly (1 John 4:7-11).