Many among his disciples heard this and said, “This is tough teaching, too tough to swallow.” Jesus sensed that his disciples were having a hard time with this and said, “Does this throw you completely? What would happen if you saw the Son of Man ascending to where he came from? The Spirit can make life. Sheer muscle and willpower don’t make anything happen. Every word I’ve spoken to you is a Spirit-word, and so it is life-making. But some of you are resisting, refusing to have any part in this.” (Jesus knew from the start that some weren’t going to risk themselves with him. He knew also who would betray him.) John 6:60-64
Without the Holy Spirit, we fail to see our need for changed lives John 14:17 “This Friend is the Spirit of Truth. The godless world can’t take him in because it doesn’t have eyes to see him, they don’t know what to look for.”
John 16:13 When the Friend comes, the Spirit of the Truth, he will take you by the hand and guide you into all the truth there is. He won’t draw attention to himself but will make sense out of what is about to happen.