In the 1970s, Sri Pedda Jeeyar Swamiji wanted to perform Swadhyaya Jnana Yajna on the hills of Tirumala for the benefit of everyone. It was an event that required thousands of priests (ruthwiks) along with many other resources to host hundreds of thousands of devotees! There was scarcity of water in Tirumala Hills and the temple executive team felt that it would be a difficult task to achieve. They weren’t sure how to convey this to Swamiji, so they cleverly requested Swamiji if there could be anything in Vedas that would first provide ample water. They suggested that the original grand scale yajna could be perfomed after the rains poured in. They believed that Swamiji would back-off from the original plan because of this requirement. However, Swamiji beautifully conducted a three-day isti (one that satisfies a desire, in this instance the desire was the need for rains) called Kaareri Isti. He gathered 3 suitable priests/scholars who dedicated their life for learning and practicing Vedas. At the end of the third day, rains started pouring..so much so that the town’s resoirvoir damn overflowed!
Such is the greatness of Veda mantras.