This, then, is the meaning of the statement in the sacred Zohar,23 that “When a tzaddik departs, he is to be found in all the worlds more than during his lifetime.”
וְזֶהוּ שֶׁכָּתוּב בַּזּוֹהַר הַקָּדוֹשׁ דְּ"צַדִּיקָא דְּאִתְפַּטַּר אִשְׁתַּכַּח בְּכֻלְּהוּ עָלְמִין יַתִּיר מִבְּחַיּוֹהִי",
That is, even in this world of action, in the mundane world of which it is written,
דְּהַיְינוּ, שֶׁגַּם בְּזֶה הָעוֹלַם הַמַּעֲשֶׂה –
“this day—to do them,”24
"הַיּוֹם לַעֲשׂוֹתָם" –
As the Gemara states,25 “Today is the time to do them; tomorrow is the time to receive their reward.” Man’s primary task in this world is the actual fulfillment of the commandments while the receipt of rewards or anything akin to rewards belongs to “tomorrow,” to the World to Come.
In any event, even in this “world of action,”
[the departed tzaddik] is found more [than during his lifetime],
אִשְׁתַּכַּח יַתִּיר:
because the action of his disciples continues to produce successive generations of offshoots,
כִּי הַמַּעֲשֶׂה (גָּדוֹל) [גָּדֵל] וְהוֹלֵךְ, גִּידּוּלֵי גִידּוּלִין,
from the “light implanted for the righteous”26 in “the field which G-d has blessed,”27 i.e., in the Garden of Eden.
מִן "אוֹר זָרוּעַ לַצַּדִּיק" בַּ"שָּׂדֶה אֲשֶׁר בֵּרְכוֹ ה'",
As will soon be explained, this refers to the illumination that is drawn down into the sefirah of malchut in the World of Atzilut, which is known as “the field which G-d has blessed.” The Torah and mitzvot of the tzaddik draw down into the sefirah of malchut an additional flow of Divine energy from the six higher sefirot (collectively known as za of Atzilut). This current arouses within his disciples thoughts of repentance and good deeds, which the Alter Rebbe calls “successive generations of offshoots”—harvests of the second generation.
[This light] radiates to the earth and to the outside places, i.e., to the Holy Land and outside the Holy Land,
הַמֵּאִיר לָאָרֶץ וְחוּצוֹת,
and also to us, those who are here this day, all of us who live in his ways,
וְגַם אֲנַחְנוּ אֵלֶּה פֹה הַיּוֹם כּוּלָּנוּ חַיִּים בִּדְרָכָיו –
“the holy way shall it be called.”28
"דֶּרֶךְ הַקֹּדֶשׁ יִקָּרֵא לָהּ".
The above, regarding the increased presence of the departed tzaddik, relates to the service of G-d, to heavenly i.e., spiritual matters; in these areas, his disciples can now receive even more guidance and benefit from him than they did during his lifetime.
זֹאת בַּעֲבוֹדַת ה' בְּמִילֵּי דִשְׁמַיָּא,
As for mundane matters, i.e., the flow of material blessings which tzaddikim draw down to this world, it is stated explicitly in the sacred Zohar29 that the tzaddikim shield the world, and after their death even more than during their life;
וּבְמִילֵּי דְעָלְמָא – בְּפֵירוּשׁ אִתְּמַר בַּזּוֹהַר הַקָּדוֹשׁ, דְּ"צַדִּיקַיָּיא מְגִינִּין עַל עָלְמָא וּבְמִיתַתְהוֹן יַתִּיר מִבְּחַיֵּיהוֹן,
moreover, were it not for the prayer of the tzaddikim in the other world, this world would not endure a single moment.
וְאִלְמָלֵא צְלוֹתָא דְצַדִּיקַיָּיא בְּהַהוּא עָלְמָא – לָא אִתְקַיֵּם עָלְמָא רִגְעָא חֲדָא".
And whoever is closer to the habitation of G-d30 [through being close to the tzaddik] during his lifetime has precedence to the blessing that comes from and through the tzaddik.
וְכָל הַקָּרוֹב קָרוֹב אֶל מִשְׁכַּן ה' בְּחַיָּיו קוֹדֵם לִבְרָכָה:
Surely, this should only apply to the higher worlds. How can this be true of this world? How is he to be found here to a greater extent than while he was alive?