By this we know that we dwell in him, and he in us, because he has given us of his Spirit.
All Commentaries on 1 John 4:13 Go To 1 John 4
Augustine of Hippo
AD 430
Begin to love; you shall be perfected. Have you begun to love? God has begun to dwell in you: love Him that has begun to dwell in you, that by more perfect indwelling He may make you perfect.
It is well: thanks be to God! We come to know that He dwells in us. And whence come we to know this very thing, to wit, that we do know that He dwells in us? Because John himself has said this: Because He has given us of His Spirit. Whence know we that He has given us of His Spirit? This very thing, that He has given you of His Spirit, whence do you come to know it? Ask your own bowels: if they are full of charity, you have the Spirit of God. Whence know we that by this you know that the Spirit of God dwells in you? Because the love of God is shed abroad in our hearts by the Holy Spirit which is given unto us. Romans 5:5