This sicha compares Shlichus to a marriage, and Hillel, Shamai, and Rabbi Akivas views on the matter. Sometimes we need to stick things out, sometimes we need to leave and all the time - we should discuss with a mashpia and Rav :)
 
(Likkutei Sichos Chelek Dalef, page 1121)

29. Noach: Every Child Born

Sichos taught by Mrs. Fruma Schapiro, moderated by Etty Schwartz. Begun as a passion project to help spread Chassidus by learning the Rebbe's words for women on the go throughout our hectic lives.