1 John

Assurance of salvation. Final warnings and conclusion.

Warning about false teachers and testing spirits.

Children of God contrasted with children of satan.

Keeping God’s commandments. Love for brothers and a warning against apostates and the spirit of AntiChrist.

The wave-particle duality nature of light and it’s application to the Trinity.

Verse by verse commentary of 1 John. His letter teaches about love, warning against false teachers like the Gnostics, and assurance of salvation.