Prometheus Overload: A Theory of Everything

From The Talos Principle Wiki

This vision occurs following the first vision after releasing Prometheus.

Athena discovers a theory of everything.

Athena: After all this time, I finally have it. The mechanics of the cosmos, from quarks to galactic filaments… everything that makes the world what it is, makes us who we are… in a single equation. The key to understanding the machine that is the universe… and to controlling it. A theory of everything. And she was right. The language of creation is a melody, and it’s beautiful. Every future is possible now. Every future… except one with Miranda in it. I can do anything except bring her back. Or unbreak Cornelius’ heart.