Nicodemus, one of the Jewish leaders, comes to Jesus believing He is from God, but at night secretly.
Jesus presses the need to be born again by the Spirit with him.
Nicodemus doesn't understand, which amazes Jesus. How can he understand anything spiritual, then? Jesus then explains what He is going to do, as simply as possible: be lifted up as the snake in the wilderness was by Moses, and ascend into heaven.
He came to save the world, not condemn it, because God loved us. We have to believe in Him to have eternal life.
Jesus goes back to Judea to baptize. John points to Him again: He is from heaven, I'm from earth.
Some are ashamed to come submit to Jesus publicly.
Even religious leaders (especially them) must be born again to enter eternal life.
Even religious leaders (especially them) can be blind to spiritual truth.
Being born again means in part, looking to Jesus lifted up on the cross for salvation from the serpent.
Believe Jesus is sent from God!
"Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him" - John 3:36