en_tn/1jn/05/20.md

Son of God

This is an important title for Jesus that describes his relationship to God. (See: rc://en/ta/man/translate/guidelines-sonofgodprinciples)

has given us understanding

"has enabled us to understand the truth"

we are in him who is true, in his Son Jesus Christ

him who is true

This one is the true God

Possible meanings are 1) "This one" refers to Jesus Christ, or 2) "This one" refers to the one true God.

and eternal life

He is called "eternal life" becasue he gives us eternal life. AT: "and the one who gives eternal life" (See: rc://en/ta/man/translate/figs-metonymy)