(Click to enlarge Kāliya-Kṛṣṇa painted on a wall in Vrindavan)
"You have seen the picture of Kṛṣṇa, He is fighting with the Kāliya serpent. He is dancing. He is not afraid of the serpent. He is dancing. As He is dancing with the gopīs in rāsa-līlā, similarly, He is dancing with the snake. Because He is ānandamayo 'bhyāsāt. He is ānandamaya, always jolly. Always. You will see Kṛṣṇa... Kṛṣṇa... Just like in Kurukṣetra the fighting is going on. Kṛṣṇa is jolly. Arjuna is morose because he is living entity, but He is not morose; He is jolly. That is the nature of God. Ānandamayo 'bhyāsāt. This is the sūtra, in the Brahma-sūtra, that 'God is ānandamaya, always jolly, always cheerful.' So you can become also cheerful when you go back to home, back to Godhead."
(Srila Prabhupada Lecture, Delhi, November 8, 1973)