We know that Action is the main thing and therefore we publicize everywhere that we stand at the conclusion of our accomplishments and work ("when you go out to war against your enemies"). We are now at the beginning of the period of the payment of the reward, "payment of the reward of the righteous" ("when you come to the land... and you inherit it and you will dwell upon it"). Accordingly, one's work also has to be connected to the days of Moshiach, beginning with learning the Torah concerning Moshiach, Redemption and the Temple. This should be done with tranquillity, joy and a gladdened heart, especially through arranging gatherings of joy. [Such an approach has] particular relevance to the celebration of a wedding and the seven days of feasting (including also strengthening "the custom of Israel" to arrange a meal for the poor). This is all a preparation for the promise that "then (in the time to come) our mouths will be filled with laughter."
For the leader of this generation, my sainted father-in-law, whose second name "Yitzchak," which means laughter and rejoicing, is the eighth ("Az" (then) in gematria is eight) leader from the Baal Shem Tov. Therefore, in this generation, we will make it so that "our mouths will be filled with laughter" (not in the future tense, "then," but) in the language of the present.
(From the talk of Shabbos Parshas Teitzei, 14 Elul 5751)
References
15. Avos 1:17 - which we learn on this Shabbos.
16. Psalm 126:2. See Brochos 31a.
