The theme of light and darkness - an easily understandable symbol for goodness and evil - is found throughout John's Gospel.
Jesus says that people must choose light or darkness. It is not predetermined. It is a choice. If they choose light (goodness), then in the their lives they reflect the light of Jesus. If they choose darkness (evil), they reflect the prince of darkness. When Judas and his companions came at night to arrest Jesus, John notes that they have "lanterns and torches." They had rejected the "light of the world" and needed artificial light.
I wonder how different today (or tomorrow) would be if we consciously took two seconds in every situation to ask ourselves "How can I be light, not darkness?"
Just asking that question might make a big difference.
Try it.
- Little White Book, Diocese of Saginaw