Adam Clarke's Commentary on the Bible

Verse 16 (1 John 4:16)

God is love - See on 1 John 4:8 ; (note). He that dwelleth in love - he who is full of love to God and man is full of God, for God is love; and where such love is, there is God, for he is the fountain and maintainer of it.

- Adam Clarke's Commentary on the Bible