Augustine of Hippo, on 1John 4:13

“In this we know that we abide in him, and he in us: because he hath given us of his spirit.”

“"In this we know that we dwell in Him and He in us, because He hath given us of His Spirit." It is well: thanks be to God! We come to know that He dwelleth in us. And whence come we to know this very thing, to wit, that we do know that He dwelleth in us? Because John himself has said this: "Because He hath given us of His Spirit." Whence know we that He hath given us of His Spirit? This very thing, that He hath given thee of His Spirit, whence comest thou to know it? Ask thine own bowels: if they are full of charity, thou hast the Spirit of God. Whence know we that by this thou knowest that the Spirit of God dwelleth in thee? "Because the love of God is shed abroad in our hearts by the Holy Spirit which is given unto us."”

Imported from an open dataset — not yet checked against the printed edition.