We, those who are materialistic persons, we are mad after sense gratification. Exactly like a person who is ghostly haunted, he speaks all sorts of nonsense, similarly, in our material condition we speak simply all nonsense.
Unless we engage our tongue in the talking of kṛṣṇa-kathā . . . vacāṁsi vaikuṇṭha-guṇanuvarṇane (SB 9.4.18). Unless we engage our tongue in describing about the glories of Vaikuṇṭha—Vaikuṇṭha means the Supreme Personality of Godhead—then we shall be talking politics and other nonsense, and waste our time. Just like the frog. The frog is crowing. That means, jihvāsatī dārdurikeva (SB 2.3.20). In the Bhāgavata it is said that we have got tongue, but if we don't use the tongue for kṛṣṇa-sevā . . .
Sevonmukhe hi jihvādau (Brs. 1.2.234). Our devotional service begins from the tongue. People will be, "How service begins from the tongue?" Yes. Sevonmukhe hi jihvādau svayaṁ eva sphuraty adhaḥ. So the tongue is very good instrument for developing devotional service. If we don't use this tongue in devotional service, then it is compared with the tongue of the frog. Jihvā dārdurikeva.
Why? Why? "My tongue is so nice. Why it is compared with the tongue of a frog?" Now, because the frog, crowing, "kakara-kaw, kakara-kaw," that means inviting the snake. The snake cannot see where is the frog, but by hearing the sound, crowing sound, the snake can understand, "Here is my food." So his crowing sound will be stopped as soon it is swallowed up by the snake.