Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 1
मैत्रेय उवाचतदेवमाकर्ण्य जलेशभाषितंमहामनास्तद्विगणय्य दुर्मद: ।हरेर्विदित्वा गतिमङ्ग नारदाद्रसातलं निर्विविशे त्वरान्वित: ॥ १ ॥
maitreya uvācatad evam ākarṇya jaleśa-bhāṣitaṁmahā-manās tad vigaṇayya durmadaḥharer viditvā gatim aṅga nāradādrasātalaṁ nirviviśe tvarānvitaḥ
Maitreya continued: The proud and falsely glorious Daitya paid little heed to the words of Varuṇa. O dear Vidura, he learned from Nārada the whereabouts of the Supreme Personality of Godhead and hurriedly betook himself to the depths of the ocean.
Materialistic warmongers are not even afraid to fight with their mightiest enemy, the Personality of Godhead. The demon was very encouraged to learn from Varuṇa that there was one fighter who could actually combat him, and he was very enthusiastic to search out the Supreme Personality of Godhead just to give Him a fight, even though it was predicted by Varuṇa that by fighting with Viṣṇu he would become prey for dogs, jackals and vultures. Since demoniac persons are less intelligent, they dare to fight with Viṣṇu, who is known as Ajita, or one who has never been conquered.