Moses then proceeded to describe the revelation of G‑d at the Giving of the Torah at Mount Sinai.
Overcoming the Limits of Creation
אַתָּה הָרְאֵתָ לָדַעַת כִּי ה' הוּא הָאֱלֹקִים אֵין עוֹד מִלְּבַדּוֹ:
(דברים ד:לה)
[Moses told the Jewish people that at Mount Sinai,] “You were shown in order to know that G d is the only deity. There is nothing other than Him.”
Deuteronomy 4:35
By revealing His essence, which is beyond Creation, G‑d enabled us to transcend the limits of nature, as well. In order to overcome life’s challenges and tests, we need only remind ourselves that “there is nothing other than Him,” i.e., that nothing can constitute a real obstacle to fulfilling G‑d’s intentions, since everything, in the final analysis, is part of G‑d’s essence. Evoking this awareness elevates our Divine consciousness to the level of truly perceiving G‑d’s essence everywhere. This, in turn, serves to hasten the Messianic Redemption, when “the glory of G‑d will be revealed and all flesh will see it together.”1
Deuteronomy 4:35 tells us: You have been shown, in order to know that the Lord He is God; there is none else besides Him.
As I understand it, the first thing we come into contact with is the Lord, and the verse tells us that the Lord is our God. As a human, I have to make an effort to "draw near to God, someone I do not know." The Lord is someone I can intuit, someone like the angel who stopped the knife that was going to sacrifice Isaac. The Adversary mentioned at the beginning of Job is also another angel; if all these manifestations are one, how can we distinguish the Lord, God Himself, from the Adversary?
This matter presents no difficulty for someone like Moses Rabbeinu because he spoke directly with God, face to face. Through Moses, God gave us the Torah. The Torah, 613 mitzvot, restrains the Adversary. I believe the Adversary still has many tricks to breach the wall of the 613 mitzvot.