In Christ's Passover prayer, He states that the glory the Father had given Him had also been given to the disciples. Christ's glory is the key to being one.
We must not limit God's glory to something physical like fire or cloud, but rather recognize God's glory as radiating from His character, which we can share.
Though it may sound pretentious or even blasphemous, God's Word shows that we will become literal offspring of the Eternal God, sharing His name and nature.
While the other accounts of Jesus' trial and crucifixion seem to show passivity, John shows Jesus totally in charge, purposefully and courageously moving.