en_tn_lite_do_not_use/1jn/04/04.md

dear children

John was an elderly man and their leader. He used this expression to show his love for them. See how you translated this in 1 John 2:1. Alternate translation: "my dear children in Christ" or "you who are as dear to me as my own children" (See: rc://en/ta/man/translate/figs-metaphor)

have overcome them

"have not believed the false teachers"

the one who is in you is

"God, who is in you, is"

the one who is in the world

Two possible meanings are 1) this refers to Satan. Alternate translation: "Satan, who is in the world" or "Satan, who works through those who do not obey God" or 2) this refers to worldly teachers. Alternate translation: "worldly teachers" (See: rc://en/ta/man/translate/figs-metonymy)