Likutei Moharan 14:2/ליקוטי מוהר"ן י״ד:ב׳

12. Yet, it is impossible to elevate the glory except through the Torah of lovingkindness. And of the Torah of lovingkindness our Sages taught: This is the one who studies Torah in order to teach it (Sukkah 49b). For this is the essence of His glory, as is brought in the Zohar (II, 69a): When the other nations come and recognize the Holy One, then the name of God ascends and is glorified above and below. This was the case with Yitro. When Yitro said (Exodus 18:11), “Now I know that God is greater than all gods,” with this God’s name ascended and was glorified.

2We find, therefore, that this is His glory—when people who are outside holiness draw closer, <to within> the [realm of] holiness. This applies equally to converts who convert and to baaley teshuvah (repentant Jews), for they were also on the outside. And when [the converts and the baaley teshuvah] are drawn closer and brought inside, this is His glory.

3But now, the glory is <itself> in exile. For the main glory is [currently] with the gentiles, whereas we, the Jewish people, are lowly and disgraced. But in the Future, when His glory will be revealed from out of the darkness, as in (Isaiah 40:5), “And the glory of God will be revealed, and all flesh shall see it”—for at that time they will all incline together “to serve Him with one consent” (Zephaniah 3:9) —then the nations will say (Isaiah 2:5), “Come, let us walk in the light of God.” And glory is called light, as is written (Ezekiel 43:2), “The earth was illuminated by His glory.”