In one of the Psalms that speaks of the ultimate return of the exiles to Zion it is written:[68] "Then will they say among the nations, 'G-d has done great things for these.' G-d has done great things for us; we were joyful."
One of the tzaddikim of Poland spelled out these words as follows:
Then will they say among the nations: When Mashiach comes the nations of the world will say,
'G-d has done great things for these:' 'G-d has done wondrous things for the Jewish people.' And we will respond,
G-d has indeed done great things for us. And the reason for this?
We were joyful!
From a talk of the Rebbe
http://www.sichosinenglish.org/books/fr ... n-2/03.htm
