He also gave him authority to execute judgment, because he is a son of man.

 (i) It may be that it refers to the unseen witness of God in a man's heart. In his first letter John writes: "He who believes in the Son of God, has the testimony (of God) in himself" ( 1 John 5:9-10). The Jew would have insisted that no man can ever see God. Even in the giving of the Ten Commandments "you heard the sound of words, but saw no form; there was only a voice" ( Deuteronomy 4:12). So this may mean: "It is true that God is invisible; and so is his witness, for it is the response which rises in the human heart when a man is confronted with me." When we are confronted with Christ we see in him the altogether lovely and the altogether wise; that conviction is the witness of God in our hearts. The Stoics held that the highest kind of knowledge comes not by thought but by what they called "arresting impressions;" a conviction seizes a man like someone laying an arresting hand on his shoulder. It may be that Jesus here means that the conviction in our hearts of his supremacy is the witness of God within. 