PURPORT

King Indra, the greatest of the demigods, was astonished to hear the instructions of Vrtrasura, 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 Prahlada Maharaja and Bali Maharaja, 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 Vrtrasura.