 The Son can do nothing of himself. In other words, what he sees the Father do, what things, whoever he does, living on the inside of him, that's what he does. He's the visible image of his invisible Father. Verse 30 says the same thing. I can of my own self do nothing as I hear I judge. My judgment's just. I seek not my will, but the will of him which sent me. Don't you understand?