All the cosmos came to be because G‑d chose to invest His very essence into a great drama: the drama of a lowly world becoming the home of an infinite G‑d. A marriage of opposites, the fusion of finite and infinite, light and darkness, heaven and earth.
We are the players in that drama, the cosmic matchmakers. With our every action, we have the power to marry our mundane world to the Infinite and Unknowable.
Sefer HaSichot 5750, vol. 1, pp. 103ff