Its foundation is in the holy mountains
Its source is in sacred words. It is founded on deep words of holiness.
("He shall surely restore it to its former state. Holy mountains are its foundation. As a remembrance forever of His covenant" - Machzor Vitry, סימן תיא; and likewise: "And I say that the Rambam undoubtedly agrees, since the conclusion of the sugya in Yevamot shows that the reason has been set aside. But its foundation is in the holy mountains, from another sugya" - Responsa Teshuvah MeAhavah, Part I, סימן מד; and likewise: "Every person as he is... just as he loves himself... so he loves his people. This love, whose foundation is in the mountains of human nature and its traits" - Berdyczewski, Writings, 2, 117; and likewise: "‘Your foundation is in the holy mountains,’ he laid his hand on my shoulder and said that I must not forget that it was my paternal grandfather who set out to seek time in the mountains" - Haim Beer, Notzot, 119)
Translation
Expression (Hebrew)
יְסוֹדוֹ מֵהַרְרֵי קֹודֶשׁ
Definition (Hebrew)
מְקוֹרוֹ בְּדִבְרֵי קֹודֶשׁ. מְיֻוסָּד עַל דִּבְרֵי קְדֻושָּׁה עֲמֻוקִּים.
("הָשֵׁב יָשִׁיב לְקִדְמָתוֹ. הַרְרֵי קֹדֶשׁ וִיסוּדָתוֹ. כְּמוֹ זֵכֶר לְעוֹלַם בְּרִיתוֹ"- מַחֲזוֹר וִיטְרִי סִימָן תיא, וְכֵן:"וְאוֹמֵר אֲנִי דוודאי מוֹדֶה הָרַמְבָּ"ם דְּמֶסְּקָנָה הַסּוּגְיָא דְּיַבָּמוֹת מוֹרֶה דְּאִידָחֵי טַעֲמָא דְּדַחְסָא. אֲבָל יְסוֹדוֹ בְּהַרְרֵי קֹדֶשׁ מִסּוּגְיָא אַחֶרֶת"- שׁוּ"ת תְּשׁוּבָה מֵאַהֲבָה חֵלֶק א סִימָן מַד, וְכֵן:"כָּל אָדָם בַּאֲשֶׁר הוּא...כְּמוֹ שֶׁהוּא אוֹהֵב אֶת עַצְמוֹ ...כֵּן הוּא אוֹהֵב אֶת עַמּוֹ.הָאַהֲבָה הַזֹּאת, אֲשֶׁר יְסוּדָתָהּ בְּהַרְרֵי טִבְעִי הָאָדָם וּתְכוּנוֹתָיו"- בֶּרְדִּיצֶ'בְסְקִי/ כְּתָבִים, ב, 117, וְכֵן:"יְסוֹדֵךְ בְּהַרְרֵי קֹדֶשׁ", הִנִּיחַ יָדוֹ עַל כְּתֵפִי וְאָמַר כִּי אַל לִי לִשְׁכֹּחַ שֶׁאָבִי סָבִי הוּא שֶׁיָּצָא לְחַפֵּשׂ אֶת הַזְּמַן בֶּהָרִים"- חַיִּים בְּאֵר/ נוֹצוֹת, 119)