בְּבֵאוּר מִדַּת הַקְּדֻשָּׁה עִנְיַן הַקְּדֻשָּׁה כָּפוּל הוּא, דְּהַיְנוּ: תְּחִלָּתוֹ עֲבוֹדָה וְסוֹפוֹ גְּמוּל, תְּחִלָּתוֹ הִשְׁתַּדְּלוּת וְסוֹפוֹ מַתָּנָה. וְהַיְנוּ: שֶׁתְּחִלָּתוֹ הוּא מָה שֶׁהָאָדָם מְקַדֵּשׁ עַצְמוֹ, וְסוֹפוֹ מָה שֶׁמְּקַדְּשִׁים אוֹתוֹ, וְהוּא מָה שֶׁאָמְרוּ זַ"ל (יומא לט א): אָדָם מְקַדֵּשׁ עַצְמוֹ מְעַט מְקַדְּשִׁים אוֹתוֹ הַרְבֵּה. מִלְּמַטָּה מְקַדְּשִׁים אוֹתוֹ מִלְּמַעְלָה.
The matter of holiness is dual. Its beginning is service [of G-d] while its end is reward; its beginning is exertion while its end is a [divine] gift. That is, its beginning is that which a man sanctifies himself, while its end is his being sanctified. This is what our sages, of blessed memory, said: "if a man sanctifies himself a little, he becomes much sanctified. If he sanctifies himself below, he becomes sanctified from above" (Yomah 39a).
