Among many millions of living entities, the number of human beings is extremely small, and among human beings who are actually religious, only some are eager to be liberated from material existence. Among many thousands of people who desire relief from material existence, one is freed from the association of unwanted persons or is relieved of material contamination. And among many millions of such liberated persons, one may become a devotee of Lord Nārāyaṇa. Therefore such devotees are extremely rare. Since bhakti, devotional service, is not ordinary, Parīkṣit Mahārāja was astonished that an asura could rise to the exalted position of a devotee. Being doubtful, Parīkṣit Mahārāja inquired from Śukadeva Gosvāmī, who then described Vṛtrāsura with reference to his previous birth as Citraketu, the King of Śūrasena.