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 1

1:5 This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.