The Epistles of John, assigned to the writer of the Fourth Gospel and the Revelation, testify that God is love and that love is the test of religion. Second John is written to “the elect lady and her children,” probably a church; Third John is addressed to “the beloved Gaius.”

1 John 5

5:9 If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son.