The Gemara (Taanis 25.) says, שקלי לא מישקל יהבי דמיהב דגמירי, "We have a tradition that [Heaven] gives, but doesn’t take away."
When someone told Rebbe Moshe Lelover that sometimes he earns parnassah but then loses it, he advised him to learn Gemara because דגמירי, when one studies גמרא, then שקלי לא מישקל יהבי דמיהב, heaven gives him parnassah and doesn’t take it away.
Before his passing, he said the day of his yahrtzeit would be mesugal for rain, and it is unnecessary to proclaim a fast day for rain before his yahrtzeit passes. Reb Shmuel Salant zt’l, the Rav of Yerushalayim, kept this counsel. He wouldn’t decree a fast day for rain until the 13th of Teves passed.
Rebbe Moshe also said that whoever does something in honor of his yahrtzeit (primarily, giving food to Yidden, such as cake and lechayim in beis medresh) will merit salvation with whatever he needs.
Zechuso Yagein Aleinu!