Likutei Moharan 34:4/ליקוטי מוהר"ן ל״ד:ד׳

14. Now, each and every Jew possesses an aspect of “a tzaddik rules,” corresponding to “a full mouth,” as in (Isaiah 60:21), “Your people, all of them are tzaddikim.” This is the <aspect> of “Israel, His rulers” (Psalms 114:2). That is, “Who rules over Me? The tzaddik.”

2For in every Jew there is something precious, an aspect of a nekudah, which his friend does not have. As in the story of Abaye and Abba Umna, where they answered him, “Your deeds do not match those of Abba Umna” (Taanit 21b). And with this aspect in which he surpasses his friend, he influences, enlightens and inspires his friend’s heart. And his friend has to receive inspiration and this aspect from him, as in (Targum, Isaiah 6:3), “One receives from the other.”

3For prior to the giving of the Torah, the rule was in God’s hand. But after the giving of the Torah, He put the rule in Israel’s hand, each [Jew] commensurate with his aspect. This is because the letters of the Torah are the embodiment of God’s will. God’s will is that the mitzvot be a particular way. For example, it was His will that the mitzvah of tefilin consist of four Torah portions, and boxes of leather, not silver. Such is His will.

4Thus it is that His will is clothed in the entire Torah. And now, with the Torah having been given over to our hands, God’s will has also been given over to our hands. We rule, as it were, so that His will is in accordance with ours. This is the aspect of “Israel, His rulers,” as mentioned. {“You, God my Lord, have done many things ; Your wonders and Your thoughts are for us” (Psalms 40:6).}

5This is as our Sages expounded (Yerushalmi, Rosh HaShanah 1:3): “You, God my Lord, have done many things”—prior to the giving of the Torah. But after the giving of the Torah, “Your wonders and Your thoughts are for us”—i.e., it is all in our hands. {“I am God your Lord, who brought you up from the land of Egypt; open your mouth wide and I will fill it” (Psalms 81:11).}

6And this is, “I am God your Lord, who brought you up from the land of Egypt”—i.e., prior to the giving of the Torah everything was “I.” But after the giving of the Torah, “open your mouth wide and I will fill it.” This is the aspect of the m’loopum, corresponding to “Yosef was the ruler”—i.e., “Who rules over Me? <The tzaddik.>” In other words, the influx of bounty is commensurate with the opening wide of the mouth and the vessels of speech, each person in accordance with his aspect.