Rabbi Shlomo (1738-1792), Chassidic Rebbe in the town of Karlin, Russia (near Pinsk), was killed in the pogroms which accompanied the Polish uprising against Russia.
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
Even before I am aware of my thoughts, He has it all worked out. (Psalms 139:4 according to the Targum)
Trusting in the One Above doesn’t mean waiting for miracles.
It means having confidence in yourself and in what you have decided to do.
Because you trust the One Above has set you on a good path and put the right ideas in your mind.
He invests in you and He trusts in you. And you should, too.