en_tn_condensed/1jn/04/13.md

we remain in him and he in us

"we continue to have fellowship with God and he continues to have fellowship with us" or "we stay joined to God and he stays joined to us"

and he in us

"and he remains in us"

By this we know ... us, because he has given

"We know ... us because he gave" or "By this we know ... us: he gave"

because he has given us some of his Spirit

"because he gave us his Spirit" or "because he has put his Holy Spirit in us." This phrase, however, does not imply that God has less of his Spirit after he has given us some.