Tzadikim are able to accomplish great things with their words because they keep their mouths pure and only speak in a holy and lofty manner. Since they do this, they merit the fulfillment of the verse (Iyov 22:28): “You will say a decree, and it will be accomplished for you.” Even their mundane speech has a great impact in Shomayim because their words are so holy, and even if they don’t intend to give a bracha, Hashem fulfills their words as a blessing.
Sefer Meohr Einei Hagolah (Ois 288) quotes the Gaon of Piltz zt”l as relating that when his grandfather, the Chidushei Harim zy”a, was a young man, he lived in the city of Warsaw, where he would sit in his room all day and study Torah with his students. The room was very small and was unable to fit all the students who clamored to study under him, which caused the Chidushei Harim a lot of anguish.
The chasidim wanted to extend the room so that there would be enough room for everyone who wanted to learn there but when this idea was presented to the Chidushei Harim, he asked, “How long will the construction take?”
When he was told that it would take four or five days, he would not allow it. He said that it was not worth it to do this if it would cause several days of bittul Torah. Despite being asked several times, he continued to refuse the offer.
The Chidushei Harim once was speaking to a close acquaintance named R’ Yokel Frohman a”h, and he said that if the construction could be done in one day, it would be very good. He added, “If you could find someone who could do it all in one day, I would get a lot of pleasure from that!”
R’ Yokel recognized how much the Rebbe wanted this to happen. Therefore, he took action. He went to see a wealthy resident of Warsaw who was a builder. This man had no children and R’ Yokel told him, “If you somehow manage to expand and renovate the Rebbe’s home within just one day, I can guarantee you that he will promise you a son within a year!”
Although this man was not associated with the chassidim, he trusted in the Chidushei Harim’s blessing and believed that he had given this promise. Therefore, he put aside all his other work and put together a team of workers for this job. They mapped out a plan and, indeed, they managed to do all the construction in just one day.
The Chidushei Harim was overjoyed by the quick and beautiful job, and he told R’ Yokel in front of a large crowd how happy he was. R’ Yokel replied, “Rebbe, you should know that this job came at a big expense. There is a bill that has to be paid. The man who took care of the construction has no children and I told him in the name of the Rebbe that he would have a son as payment for the job!”
When he heard this, the Chidushei Harim was silent for a few minutes. This made R’ Yokel very nervous. He was worried that the Rebbe was upset at him, so he fled the room. However, the Chidushei Harim turned to his grandson, the Rov of Piltz, and said with a smile, “What do you say to what R’ Yokel did? What I couldn’t do on my own, he did on my account. Hashem will certainly help.”
The man had a son that year and the Chidushei Harim served as sandik at the bris.
