Rabbi Isaac of Homil (18th-19th Century Ukrainian Kabbalist): Shnei Meorot
The moon, when she was first created, was a glistening jewel. She did not merely reflect light, but rather transformed it and brought out its inner beauty, much as a precious stone glistens with a secret, hidden light all its own. In her own way, the moon was greater than the sun—for the sun only shines from its surface, whereas the moon shone from its inner essence. The sun holds the light that extends outward, whereas the moon holds the light of being.
And so will be, once again, and much more so, in the time to come, once we have transformed the world with the Torah and its mitzvot.