לְמַ֤עַן צִיּוֹן֙ לֹ֣א אֶחֱשֶׁ֔ה וּלְמַ֥עַן יְרוּשָׁלִַ֖ם לֹ֣א אֶשְׁק֑וֹט עַד־יֵצֵ֤א כַנֹּ֙גַהּ֙ צִדְקָ֔הּ וִישׁוּעָתָ֖הּ כְּלַפִּ֥יד יִבְעָֽר׃
為了錫安的緣故，我必不靜默；為了耶路撒冷的緣故，我必不安息，直到她的公義如光輝發出，她的拯救如燃燒的火炬。
Rashi
For the sake of Zion I will do, and I will not be silent concerning what they did to her.
Ibn Ezra
For Zion’s sake will I not, etc. Thus Israel will speak, when in exile.
Malbim
"for Zion's sake" He came back to speak of two matters which he recalled in the previous section. 1. The righteousness which Gd desires to reveal, the righteousness of Israel and the truth of their Torah and their faith. 2. The salvation which Gd desires to bring to them. Zion represents the righteousness of Israel because Zion was the location of the Sanhedrin and the Holy Temple, and Jerusalem represents the salvation of Israel because there the masses dwelt and to there the scattered ones were gathered, as it is written "...put on your strength, O Zion; put on the garments of your beauty, Jerusalem..." (Is. 52:1) Zion will clothe herself with inner might, the spiritual successes, and Jerusalem external garments - the physical successes. In order to clarify the righteousness of Israel and the truth of their Torah one must argue with words and claims, and on this it says -
Rashi
I will not rest There will be no peace before Me until her righteousness comes out like brilliance.