Excerpt from Pope Benedict XVI's Easter Vigil homily:
In the resurrection, we see the most sublime fulfilment of what this text describes as the beginning of all things. God says once again: “Let there be light!” The resurrection of Jesus is an eruption of light. Death is conquered, the tomb is thrown open. The Risen One himself is Light, the Light of the world. With the resurrection, the Lord’s day enters the nights of history. Beginning with the resurrection, God’s light spreads throughout the world and throughout history. Day dawns. This Light alone – Jesus Christ – is the true light, something more than the physical phenomenon of light. He is pure Light: God himself, who causes a new creation to be born in the midst of the old, transforming chaos into cosmos.