A person who can speak meaningful words and with all politeness and good qualities is called vāvadūka, or fluent. There is a nice statement in Śrīmad-Bhāgavatam regarding Kṛṣṇa's speaking politely. When Kṛṣṇa politely bade His father, Nanda Mahārāja, to stop the ritualistic offering of sacrifice to the rain-god, Indra, a wife of one village cowherd man became captivated. She later thus described the speaking of Kṛṣṇa to her friends: "Kṛṣṇa was speaking to His father so politely and gently that it was as if He were pouring nectar into the ears of all present there. After hearing such sweet words from Kṛṣṇa, who will not be attracted to Him?"
Kṛṣṇa's speech, which contains all good qualities in the universe, is described in the following statement by Uddhava: "The words of Kṛṣṇa are so attractive that they can immediately change the heart of even His opponent. His words can immediately solve all of the questions and problems of the world. Although He does not speak very long, each and every word from His mouth contains volumes of meaning. These speeches of Kṛṣṇa are very pleasing to my heart."