John 5:37

The Father. The supreme witness to the truth that is in Christ is to be found neither in human testimony nor in the works of Jesus, but in the voice of God speaking to the human heart. When the Christian knows in his own heart that “the Father himself . . . hath borne witness of” Christ, he is possessed of a certainty that transcends all other assurances. Perhaps Jesus thought also of the voice from heaven at His own baptism (see on Matt. 3:17).

Ye have neither. Jesus’ hearers had heard the testimony of John, and they had seen Jesus’ works, but of the third kind of testimony, the witness of the Father revealed to the heart, they knew nothing, for, as Jesus told them, “whom he hath sent, him ye believe not” (v. 38). Although hearing human testimony and observing the deeds of Jesus may come before faith, the supreme proof of the Messiahship and deity of Jesus Christ can be had only after faith has begun to grow in the heart. Only by the ear and the eye of faith can the Father be heard and seen and can the word He speaks about Jesus Christ abide in man and be apprehended by him. But when this word does abide and is apprehended, there is no greater certainty.