Our tongues always engage in vibrating useless sounds that do not help us realize transcendental peace. The tongue is compared to a desert because a desert needs a constant supply of refreshing water to make it fertile and fruitful. Water is the substance most needed in the desert. The transient pleasure derived from mundane topics of art, culture, politics, sociology, dry philosophy, poetry and so on is compared to a mere drop of water because although such topics have a qualitative feature of transcendental pleasure, they are saturated with the modes of material nature. Therefore neither collectively nor individually can they satisfy the vast requirements of the desert-like tongue. Despite crying in various conferences, therefore, the desert-like tongue continues to be parched.
Lord Caitanya’s movement of Kṛṣṇa consciousness is full of dancing and singing about the pastimes of Lord Kṛṣṇa. It is compared herein to the pure waters of the Ganges, which are full of lotus flowers. The enjoyers of these lotus flowers are the pure devotees, who are like bees and swans. They chant like the flowing of the Ganges, the river of the celestial kingdom. The author desires such sweetly flowing waves to cover his tongue. He humbly compares himself to materialistic persons who always engage in dry talk from which they derive no satisfaction. If they were to use their dry tongues to chant the holy name of the Lord-Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare-as exemplified by Lord Caitanya, they would taste sweet nectar and enjoy life.
Ref >> Srila Prabhupada Vani.