When we observe the moon, we know its light is reflected of, and thus less bright than, the sun. Every month we watch it fade each night for more than two weeks before it begins to return to its former not-so-bright brightness.
Each month, while the moon is still young but has gained reasonable substance (ideally between the third and seventh of the month), we say Kiddush Levana, “Blessing” (making/recognizing the holiness) of the Moon. Part of the service prays that The Creator restores the moon to its original brightness (before it was diminished–but that’s a separate teaching). It continues, וִיהִי אוֹר הַלְּבָנָה כְּאוֹר הַחַמָּה וּכְאוֹר שִׁבְעַת יְמֵי בְרֵאשִׁית, “May the light of the moon become like the light of the sun, and the light of the seven days of Creation.”
For us to be able the witness the light of the moon become as bright as the sun is in our times would violate every law of nature. For the moon to reflect that much light, the sun would have to radiate proportionally more light which would certainly make all life on earth, including ourselves to observe, impossible.
Perhaps when we make this prayer, we imagine a world that exists at a higher level of reality than the one bound by nature to which we’re accustomed.
As we ascend to reach the highest realms, these highest realms race down to join us.