When Nanda and other cow-herds heard the speech of Krishna, their faces were brilliant with joy and they said that he had spoken well. "You have judged aright, child" exclaimed they "we will do exactly as you have said and offer worship to the mountain".

In plain words: When Nanda and the other cowherds heard Krishna, their faces lit up with joy. They agreed he had spoken well and said they would do just as he said and worship the mountain.