By the Grace of G-d8th of Menachem Av, 5724Brooklyn, New York
Greeting and Blessing:
As we are now commemorating the sad events which led to the Destruction of the Beth Hamikdash and the beginning of the present Exile, it should be remembered that the purpose of this commemoration is not just to inflict a sad period upon ourselves, but rather that we should be reminded and inspired to do all we can to lessen, and eventually remove altogether, the cause which brought about the sad events which we are now commemorating.
For, as we declare in our prayers, "Because of our sins we have been exiled from our land,"1 It was the neglect of the Torah and Mitzvoth, in the daily life and practice, which resulted in the Destruction and Exile. Therefore, efforts to strengthen and spread the observance of the Torah and Mitzvoth in the daily life will hasten the complete Redemption through our righteous Moshiach, and, as promised, those sad days will be transformed into days of Joy.2
With blessing,
M. Schneerson
Notes and sources
This letter was sent to Camp Gan Israel Swan Lake N.Y.; Camp Gan Israel, Lac Desert, P. Q. Canada; Camp Gan Israel, Minneapolis, Minn.; Tzeirei Agudas Chabad (unknown branch).
1) Musaf prayer recited on the festivals.
2) See Zechariah 8:19; Mishneh Torah, Hilchos Taanis, 5:19.
Source: Photocopy of original
Published: Teshura, (Marlow-Mockin, 14 Shevat, 5774).
Source & Link: תשורה 5774-05-14 מארלאוו-מאצקין:
Alternative Source:
אס"ל ח"א (הוצ' שני'), pg. 217: https://docs.google.com/document/d/1vFa1HmjxBQKProY9L_x_3v2p6vdY7g3eWzpKzGm1JBI/edit?usp=drivesdk
https://www.chabad.org/therebbe/letters/default_cdo/aid/2064680/jewish/How-to-Rebuild-the-Beit-Hamikdash.htm