The Rebbe reassures that efforts in outreach are never in vain, even if results aren’t immediately visible. Resistance itself indicates an inner impact. He advises continued, tactful encouragement in Torah, mitzvos, and Chassidus. Additionally, he expresses confidence in the recipient’s ongoing support for Achi Temimim in Rishon LeZion .
https://www.torahrecordings.com/rebbe/igroskodesh/014/005/5129