|Canto 6: Prescribed Duties for Mankind||Chapter 12: Vṛtrāsura's Glorious Death|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 6.12.18
indro vṛtra-vacaḥ śrutvā
tam āha gata-vismayaḥ
śrī-śukaḥ uvāca — Śrī Śukadeva Gosvāmī said; indraḥ — King Indra; vṛtra-vacaḥ — the words of Vṛtrāsura; śrutvā — hearing; gata-alīkam — without duplicity; apūjayat — worshiped; gṛhīta-vajraḥ — taking up the thunderbolt; prahasan — smiling; tam — unto Vṛtrāsura; āha — said; gata-vismayaḥ — giving up his wonder.
Śukadeva Gosvāmī said: Hearing the straightforward, instructive words of Vṛtrāsura, King Indra praised him and again took the thunderbolt in his hand. Without bewilderment or duplicity, he then smiled and spoke to Vṛtrāsura as follows.
King Indra, the greatest of the demigods, was astonished to hear the instructions of Vṛtrāsura, who was supposed to be a demon. He was struck with wonder that a demon could speak so intelligently. Then he remembered great devotees like Prahlāda Mahārāja and Bali Mahārāja, who had been born in the families of demons, and thus he came to his senses. Even so-called demons sometimes have exalted devotion for the Supreme Personality of Godhead. Therefore Indra smiled reassuringly at Vṛtrāsura.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness