Perfected Love, Confidence, and Love for the Brother
John connects perfected love with confidence in the day of judgment. “Perfect love casteth out fear” does not mean that all forms of reverence, caution, or emotional fear are sinful; the immediate fear is fear that has punishment or torment in view. Assurance grows as God’s love reaches its intended maturity. The direction of love remains crucial: “We love him, because he first loved us.” The section then returns to the practical test that dominates the letter. A claim to love God is exposed as false when joined to hatred of a visible brother. Love of God and love of neighbor cannot be separated. This is the Johannine development of a command deeply rooted in the Law and restated by Jesus: genuine devotion to the unseen God must take visible form in love for people.