[S]o many … dedicated people, having no one but themselves to save themselves, end up disillusioned … They are disillusioned because they started out with a great illusion. For them there is no sinner or no sin …
It is the night before Jesus is crucified. Christ is fulfilling the role of a high priest by interceding for his followers – both in prayer and by then going to the cross. He prays for both the disciples that were with him and future disciples like us.
Heavenly wisdom is that uncommon quality that makes smart people good and good people easier to get along with. See also below: The Inner Ring, by C.S. Lewis, an essay that connects well with this passage.
Strictly speaking spiritual renewal doesn’t follow any strict formula. It’s a work of God’s grace and, as such, is entirely dependent upon Him. Still, if we are willing to recognize our need for spiritual renewal, then we can take conscious steps in that direction. God, as it happens, loves to move in the lives of people who are earnestly seeking Him.
With most musical instruments, every time you play, you have to check them just to see how far they’ve gotten out of whack. We’re the same way in that we need to “stay in tune with Jesus” by keeping our thought life and attitudes in the right place. To stay in tune with Jesus, our thoughts and our attitudes need to be repeatedly adjusted.