1. So that you will believe (18-24)
Jesus' heart was troubled, for he loved Judas. Judas did not accept Jesus' words. So the devil easily entered his empty heart and planted greed there (2; 6:68-71). Jesus mentioned Judas' betrayal to keep the disease of unbelief from spreading to the others. After the crucifixion, Judas' betrayal became one evidence of Jesus' truthfulness.
2. Judas took the bread and went out (25-30)
The disciples didn't know each other well. They had no idea who the betrayer would be. Jesus indicated the betrayer when he gave the bread to Judas, but still they did not understand. Judas took the bread as he had accepted Jesus' love--without any thanks. He went out and it was night. He left the Light of the World to go to the blackness of hell. Judas tried to be a disciple without accepting Jesus' words of life.
Application: Lord, dwell in my heart. Let your word be in me so that I won't be a Judas.
One Word: Stay in the light with Jesus