In this chapter John teaches that all Christians are still sinners. But God continues to forgive a Christian's sins. (See: [[rc://en/tw/dict/bible/kt/sin]] and [[rc://en/tw/dict/bible/kt/faith]] and [[rc://en/tw/dict/bible/kt/forgive]])
In this chapter John writes that God is light. Light is a metaphor for understanding and righteousness. (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/tw/dict/bible/kt/righteous]])
John also writes about people walking in the light or in the darkness. Walking is a metaphor for behaving or living. People who walk in the light understand what is righteous and do it. People who walk in the darkness may not understand what is righteous, and they do what is sinful.