O Shauri! Once the cowherds were collecting the requisite material to perform a Yagya to appease Indra. Thou wanted to humble the pride of Indra. In spite of knowing what the preparations were for, Thou, in full humility and politeness asked Nanda and the other cowherds, 'O Father what is this your effort for?'
Nanda told Thee, 'O son! A yagya has to be performed for Indra every year. He gives happiness to the earth by rain. The livelyhood of all human beings on earth depends on rain. Especially so for us, because our cattle live on grass and water alone.'