In our days we have completed all the requisite actions and Divine service, in all the details symbolized by the "hundred years," the "twenty years," and the "seven years" associated with the age of the Matriarch Sarah's passing, years which like Sarah's were all equally good.

This is consistent with the words of my sainted father-in-law, the leader of our generation, that we have already "polished the buttons" (i.e. even our outer garments have been perfected, and there's nothing left (collectively) to fix) and we therefore stand ready to receive our righteous Moshiach.

More particularly, since then (the statement of the Previous Rebbe that the "buttons have been polished") several decades have elapsed, during which time the Jewish people have cried out "ad mosai - how long must we remain in exile!" (which must also have a limit.)

May it thus be G-d's Will -- that the true and complete Redemption, through our righteous Moshiach, occur immediately.

(From the Chasidic Discourse "Vayihiyu Chayei Sarah, 5751 (1990)" -
Sefer HaMa'amarim Melukat, vol. V p. 60)