en_tn_condensed/1jn/02/05.md

keeps his word

"does what God tells him to do"

in him truly the love of God has been perfected

"it is that person who loves God completely" or 2) "the love of God" refers to God loving people, and "perfected" represents completing its purpose. Alternate translation: "God's love has achieved its purpose in that person's life"

By this we know that we are in him

"When we obey what God says, we can be certain that we have fellowship with him" or "By this we know that are joined to God"