The words of the Rambam come to mind. “The foundation of foundations and the pillar of wisdoms is to know that there is a First existence. He brings into existence all of existence; all that is existent from the heaven and earth, and what is between them, only exist from the truth of His existence. If you could imagine that He doesn’t exist then nothing else would be able to exist. And if you can imagine that nothing else, other than Him, exists, He alone would still exist. He would not be nullified if he were to nullify everything else. For all of existence is contingent on Him and He, blessed is He, is not contingent on them, or even one of them. Therefore His truth is not like the truth of anyone of them. This is what the prophet says “And Hashem, G-d, is truth.” He alone is truth and there is no truth like Him. And this is what the Torah said “There is none other besides Him,” as to say, there is no other true existence other than Him.” In short, G-d is that necessary, non-contingent, self-sufficient being that is the ground of all of existence. Deeper: G-d is existence, G-d is being, G-d simply IS.
This world is a world of becoming, of movement, of transience - the World of Action. The world chases after money, pleasure, power, comfort; and sometimes the world just chases. The world chases after non-existence. It lives and breathes within the illusions of the matrix. And in the midst of all of this, within extreme temporality, I sense the eternal. My mind wanders upwards, beyond, and I glimpse behind the curtains. I remember that this world is merely a faint projection of higher – real, true - worlds. “The Divine presence pervades all of existence,” says Rav Kook, and I find Him in the jarring experience of acutely encountering non-truth. Non-existence shows its imaginary face and “I lift up my eyes to the mountains, from where will my help come from?”