Augustine of Hippo — as excerpted in the Catena Aurea on John 3:27-30

“(Tr. xiv. c. 3) Or thus; This my Joy is fulfilled, i. e. my joy at hearing the Bridegroom’s voice. I have my gift; I claim no more, lest I lose that which I have received. He who would rejoice in himself, hath sorrow; but he who would rejoice in the Lord, shall ever rejoice, because God is everlasting.”