Likutei Moharan 177:3/ליקוטי מוהר"ן קע״ז:ג׳

13. [And this is:] {May His great Name be exalted and be sanctified in the world which He created in accordance with His will, and reign be given to His kingship (Kaddish Prayer) .} … in the world which He created in accordance with His will, and reign be given to His Malkhut, Kingship—Malkhut is an aspect of glory. As it is written (Psalms 145:11), “Of the glory of Your kingdom they shall speak.” It is also an aspect of will, for a person’s will is his glory (Yerushalmi, Peah 1:1).

2Now, when a person is content with and disposed towards God’s will—exactly as He wills it—he then gives reign to His kingship. For the essence of Malkhut is from the will. This is, “… in the world which He created in accordance with His will, and reign be given to His Malkhut”—for the essence of Malkhut is from the will, as above.

3However, when a person wants some other will, distinct from God’s will—through this the kingship of others, of the gentiles, is created. And, commensurate with the other will, such is the degree of kingship that is created for some gentile.

4For a person has to completely nullify his will vis-à-vis the will of God. He should have no other will whatsoever, other than what God wills: be it that he have money and children, or not, God forbid; be it all the other wills. He should not want any other will other than as God wills.