Likutei Moharan 80:3/ליקוטי מוהר"ן פ׳:ג׳

13. The upshot of this is that Yosef is the aspect of peace, and peace is the vessel through which all bounty and blessing come to Israel. The Blessed One’s intention with this is to enable every Jewish person to speak words of holiness before God.

2What is holiness? Wisdom. Wisdom is called <holy>, as is known. Thus when a person recites the words of Torah and prayer with wisdom and intellect, and he understands and gives ear to <what he is saying>, it is called holiness. God has great pleasure from this, because it forms mentalities, which is wisdom, [and it builds] speech, which corresponds to Jerusalem.

3{“YHVH (God) builds Jerusalem, He gathers in the outcast of Israel” (Psalms 147:2).} This is the meaning of “YHVH builds Jerusalem.” “Jerusalem” is the aspect of speech, as it is written (Genesis 14:18), “MaLKiTZeDeK, the MeLeKh (king) of Shalem”—which Onkelos renders as: king of Jerusalem. TZeDeK is speech, as it is written (Psalms 58:2), “you ought to be speaking tzedek (justice).” “YHVH” corresponds to mentalities, as is known. When is [Jerusalem] built? When “<[YHVH] gathers in> the outcast of Israel”—that is, someone who <is> “cast out” from the aspect of Israel afterwards is gathered in.