27 John answered and said, A man can receive nothing unless it be given him out of heaven. 28 Ye yourselves bear me witness that I said, I am not the Christ, but, that I am sent before him. 29 He that has the bride is the bridegroom; but the friend of the bridegroom, who stands and hears him, rejoices in heart because of the voice of the bridegroom: this my joy then is fulfilled. 30 He must increase, but I must decrease.
31 He who comes from above is above all. He who has his origin in the earth is of the earth, and speaks [as] of the earth. He who comes out of heaven is above all, 32 [and] what he has seen and has heard, this he testifies; and no one receives his testimony. 33 He that has received his testimony has set to his seal that God is true; 34 for he whom God has sent speaks the words of God, for God gives not the Spirit by measure. 35 The Father loves the Son, and has given all things [to be] in his hand. 36 He that believes on the Son has life eternal, and he that is not subject to the Son shall not see life, but the wrath of God abides upon him.
Matthew Henry's Commentary on John 3:27-36
Commentary on John 3:22-36
(Read John 3:22-36)
John was fully satisfied with the place and work assigned him; but Jesus came on a more important work. He also knew that Jesus would increase in honour and influence, for of his government and peace there would be no end, while he himself would be less followed. John knew that Jesus came from heaven as the Son of God, while he was a sinful, mortal man, who could only speak about the more plain subjects of religion. The words of Jesus were the words of God; he had the Spirit, not by measure, as the prophets, but in all fulness. Everlasting life could only be had by faith in Him, and might be thus obtained; whereas all those, who believe not in the Son of God, cannot partake of salvation, but the wrath of God for ever rests upon them.