Who could list the innumerable transcendental qualities of Prahlāda Mahārāja? He had unflinching faith in Vāsudeva, Lord Kṛṣṇa [the son of Vasudeva], and unalloyed devotion to Him. His attachment to Lord Kṛṣṇa was natural because of his previous devotional service. Although his good qualities cannot be enumerated, they prove that he was a great soul [mahātmā].
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
गुणैरलमसङ्ख्येयैर्माहात्म्यं तस्य सूच्यते । वासुदेवे भगवति यस्य नैसर्गिकी रतिः
guṇairalamasaṅkhyeyairmāhātmyaṃ tasya sūcyate | vāsudeve bhagavati yasya naisargikī ratiḥ
SB 7.4.36