“The glory of G‑d will be revealed and all flesh will see as one that the mouth of G‑d has spoken.”1"וְנִגְלָה כְּבוֹד הַוַי' וְרָאוּ כָל בָּשָׂר יַחְדָּו כִּי פִּי הוי' דִּבֵּר"
Among the new developments that will characterize the Ultimate Future, the era after Mashiach’s coming, will be the revelation of “the glory of G‑d”וְהַיְינוּ שֶׁבֵּין הָעִנְיָנִים שֶׁיִּתְחַדְּשׁוּ לֶעָתִיד לָבוֹא בְּבִיאַת הַמָּשִׁיחַ יִהְיֶה גַּם הַחִדּוּשׁ דְּ"וְנִגְלָה כְּבוֹד הוי'
and also that “all flesh will see as one that the mouth of G‑d has spoken.”וְרָאוּ כָל בָּשָׂר יַחְדָּו כִּי פִּי הוי' דִּבֵּר".
As will be explained, each of the clauses in this verse reflects a distinct spiritual development.
To explain this concept:וְהָעִנְיָן בָּזֶה,
The name of G‑d used in this verse is Havayah, the Divine name that connotes G‑d’s transcendence: how He is past, present, and future simultaneously,2דְּהִנֵּה הוי' הוּא הָיָה הֹוֶה וְיִהְיֶה כְּאֶחָד
beyond the structures and limitations of time and space.שֶׁלְּמַעְלָה מִזְּמַן וּמָקוֹם,
Our world is defined according to the structures of time and space. G‑d’s name Havayah reflects a framework of being that is not structured by those or any other limits, but instead, is utterly unbounded and undefined.
In the gestalt that presently governs the world, in order that there be a revelation of the level of G‑dliness associated with His name Havayahוּבִכְדֵי שֶׁיִּהְיֶה הַגִּלּוּי דְּשֵׁם הוי'
– even if solely in the realm of understanding and comprehension, i.e., on the intellectual plane and not in tangible reality,אֲפִלּוּ בַּהֲבָנָה וְהַשָּׂגָה בִּלְבָד,
and certainly this applies when speaking about a revelation on the level of recognition,וּמִכָּל שֶׁכֵּן שֶׁיִּהְיֶה הַגִּלּוּי בְּאֹפֶן שֶׁל הַכָּרָה,
that the person will not only comprehend the matter intellectually, but will identify with its truth to the extent that it become the way he views the world,
and especially for this revelation to be on the level of sight –וּבִפְרָט בְּאֹפֶן שֶׁל רְאִיָּה,
vast and extensive toil is necessary.צָרִיךְ לָזֶה יְגִיעָה רַבָּה וַעֲצוּמָה כוּ'.
One must labor with his mind and heart to train them to appreciate this spiritual truth even on a mere intellectual level. How much more so for this truth to become so real that he actually sees that it is so.
This represents the new development that will characterize the Ultimate Future, the age of Mashiach:וְזֶהוּ הַחִדּוּשׁ דְּלֶעָתִיד לָבוֹא,
that the revelation of G‑dliness will be through actual sight, i.e., with eyes of flesh, not merely with “the eye of the mind,”שֶׁיִּהְיֶה הַגִּלּוּי דהוי' בְּאֹפֶן שֶׁל רְאִיָּה בְּעֵינֵי בָּשָׂר
(as the verse states: “All flesh will see”).(וְרָאוּ כָל בָּשָׂר),
This revelation will comprise both “the glory of G‑d” –הֵן הַגִּלּוּי דִּבְחִינַת כְּבוֹד הוי',
the term “glory” refers to an encompassing light,3 for “glory” is a quality that can neither be understood nor internalized –שֶׁכָּבוֹד הוּא אוֹר מַקִּיף,
as well as the revelation of the aspect of “the mouth of G‑d,”וְהֵן הַגִּלּוּי דִּבְחִינַת פִּי הוי'
which refers to an internalized light, for the life-force of every created being originates in G‑d’s speech.שֶׁהוּא אוֹר פְּנִימִי,
Moreover, this revelation will enable “all flesh [to] see as one,”וְהַגִּלּוּי יִהְיֶה בְּאֹפֶן דְּ"רָאוּ כָל בָּשָׂר יַחְדָּו"
i.e., everyone will share this awareness equally.דְּהַיְינוּ לְכֻלָּם בְּשָׁוֶה,
As stated in other verses,4 “The earth will be filled with the knowledge of G‑d,”וּכְמוֹ שֶׁכָּתוּב בְּמָקוֹם אַחֵר: "כִּי מָלְאָה הָאָרֶץ דֵּעָה אֶת הוי'",
and “All will know Me, from the small to the great,”5כִּי כֻּלָּם יֵדְעוּ אוֹתִי לְמִקְּטַנָּם וְעַד גְּדוֹלָם,
in all-encompassing equality.כֻּלָּם בְּשָׁוֶה.
As is well known,6 the preparations that make possible all the revelations of the Ultimate Future depend onוְהִנֵּה יָדוּעַ שֶׁהַהֲכָנָה לְכָל הָעִנְיָנִים שֶׁיִּהְיוּ לֶעָתִיד לָבוֹא הִיא עַל יְדֵי
the Divine service of the present era,הָעֲבוֹדָה בַּזְּמַן הַזֶּה,
and, especially, during the era of exile.וּבִפְרָט בִּזְמַן הַגָּלוּת.
More particularly, the preparation that will enable the revelation of the name Havayah isוְהַהֲכָנָה לְגִלּוּי שֵׁם הוי' הִיא
reflected by the verse:7 “And you shall serve G‑d (Havayah) your L-rd (Elokeichem)”:מַה שֶּׁכָּתוּב "וַעֲבַדְתֶּם אֶת הוי' אֱלֹקֵיכֶם",
That verse teaches that our Divine service must be carried out to such an extent that Havayah, G‑d’s transcendent dimensionהַיְינוּ, שֶׁתִּהְיֶה עֲבוֹדַתְכֶם כָּל כָּךְ עַד שֶׁבְּחִינַת הוי'
(that is past, present, and future simultaneously,)(שֶׁפֵּרוּשׁוֹ הָיָה הֹוֶה וְיִהְיֶה כְּאֶחָד)
becomes internalized as Elokeichem, “your Elokim,” i.e., your individual strength and vitality.תִּהְיֶה אֶצְלְכֶם בִּבְחִינַת אֱלֹקֵיכֶם כְּאִלּוּ הוּא אֱלֹקִים שֶׁלָּכֶם,
G‑d’s name Elokim is associated with the quality of strength.8 And similarly, the Hebrew term א-להים is numerically equivalent to הטבע, “nature,” referring to the G‑dly light which enclothes itself within every created being to provide it with vitality. Our Divine service involves comprehending that the infinite G‑dliness connoted by the name Havayah is our strength and nature,9 i.e., one should draw down the G‑dly light that transcends all limitations to the extent that it becomes an active force within his consciousness.
This service will bring about the revelation of G‑d’s name Havayah in the Ultimate Future.וְעַל יְדֵי זֶה יִהְיֶה הַגִּלּוּי דְּשֵׁם הוי' לֶעָתִיד לָבוֹא,
This is what is meant by the verse: “The glory of G‑d will be revealed and all flesh will see as one that the mouth of G‑d has spoken.”שֶׁזֶּהוּ מַה שֶּׁכָּתוּב "ונִגְלָה כְּבוֹד הוי' וְרָאוּ כָל בָּשָׂר יַחְדָּו כִּי פִּי הוי' דִּבֵּר".

Summary

Among the new developments that will characterize the era following Mashiach’s coming will be a) the revelation of “the glory of G‑d,” and b) “all flesh will see as one that the mouth of G‑d has spoken.” The name of G‑d used in this verse is Havayah, the Divine name that connotes G‑d’s transcendence: how He is past, present, and future simultaneously. This revelation will enable “all flesh [to] see as one,” i.e., everyone will share the awareness of G‑d’s transcendence equally.
Our Divine service in the present era prepares us for the revelations of the Ultimate Future. More particularly, the preparation that will enable the revelation of the name Havayah is reflected by the verse: “And you shall serve G‑d (Havayah) your L-rd (Elokeichem)” – i.e., that our Divine service will be carried out to the extent that Havayah, G‑d’s transcendent dimension, becomes internalized as Elokeichem, “your Elokim,” i.e., our individual strength and vitality.