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

5:7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.