(Painting by Paulo Zubato)
This segulah is mentioned in Chayei Moharan 25:
After giving the lesson "Rabbi Shimon began," in Likutei Moharan I 60 the Rebbe said humorously, "Today I have said three things contrary to what people usually say. People say stories help you go to sleep. But, I said that through stories it is possible to rouse men from their sleep. People say talk will not make someone pregnant. But, I said that the conversations of the Tzaddik and his stories, which rouse men from their sleep, lead to God's remembering barren women. People say the truly great Tzaddik does not need much money. What does he need it for? But, I said there is a certain kind of contemplation, which requires all the riches in the world.