Tonight it all happens. This is the night, as we proclaim in the Exsultet.
Tonight the darkness becomes Light. The night becomes the Day. The long history of sin, in its pointlessness, hurt, violence, and meaninglessness, is overwhelmed by a Joy so creative that it makes a New Creation and a Creativity so joyful that it has no room to remember the misery, anxiety, and depression we have insisted upon for ourselves with our own sins.
Tonight the end becomes the beginning, the omega and the alpha are drawn together into one: The Sabbath of rest which concludes the creation becomes the dawn of the first day resounding with the announcement of the Resurrection inaugurating the New Heavens and the New Earth: "Let there be Light."