During the Three Weeks, from 17th of Tamuz to the 9th of Av, we commemorate the conquest of Jerusalem, the destruction of the Holy Temple and the dispersion of the Jewish people.
Weddings and other joyful events are not held during this period; like mourners, we do not cut our hair, and various pleasurable activities are limited or proscribed. (The particular mourning customs vary from community to community, so consult a competent halachic authority for details.)
Citing the verse (Isaiah 1:27) "Zion shall be redeemed with mishpat [Torah] and its returnees with tzedakah," the Rebbe urged that we increase in Torah study (particularly the study of the laws of the Holy Temple) and charity during this period.
Links:
The Three Weeks
Pessimism comes with a thousand arguments. Maybe you don’t deserve to be saved from the mess you’ve gotten into. Maybe you deserve punishment, G‑d forbid. Maybe the only way to save your soul is through a dark tunnel.
That’s not called trust. Trust means you have not a shade of doubt that He will deliver—no matter who you are and what you’ve been up to—and it will all be good, every step along the way.
As for your mess-ups, He knows you regret them all, and He is a kind and loving G‑d.
And so, He delivers.