John 8:26-30 I have many things to say and to judge of you: but he that sent me is true; and I speak to the world those things which I have heard of him. They understood not that he spoke to them of the Father. Then said Jesus unto them, When you have lifted up the Son of man, then shall you know that I am he, and that I do nothing of myself; but as my Father has taught me, I speak these things. And he that sent me is with me: the Father hath not left me alone; for I do always those things that please him. As he spoke these words, many believed on him.
While continuing the discourse with the Jews, Jesus said that He had many things to say and to judge them of: but that the Father that sent Him is true; and He spoke to them those things which He has heard of the Father. (John 8:14, 16, 18, 26). The Jews didn’t understand that He spoke to them of the Father.
Jesus explained to them that when they have lifted up (crucified, John 3:14; 12:34) the Son of Man, then by His resurrection and ascension shall they know that He is the light of the world, the Son of God.
He did nothing of Himself; but as His Father taught Him; we learn from Christ’s Union with the Father the following: The Son can do nothing of Himself (John 5:17, 19, 30; 8:18, 28); Christ did not seek His own will, but the will of the Father (John 5:30; 6:38); He didn’t seek His own glory (John 8:50, 54); His doctrine was not His, but the Father that sent Him (John 7:16; 8:26, 38); Christ always did those things that please the Father (John 8:29); He came from God, not of Himself (John 8:42; 16:28); He did not speak of Himself, but the Father commanded Him what to speak (John 10:25, 37-38; 14:10-11).