Although Prahlāda Mahārāja was born in a family of asuras, he himself was not an asura but a great devotee of Lord Viṣṇu. Unlike the other asuras, he was never envious of Vaiṣṇavas. He was not agitated when put into danger, and he was neither directly nor indirectly interested in the fruitive activities described in the Vedas. Indeed, he considered everything material to be useless, and therefore he was completely devoid of material desires. He always controlled his senses and life air, and being of steady intelligence and determination, he subdued all lusty desires.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नोद्विग्नचित्तो व्यसनेषु निःस्पृहः श्रुतेषु दृष्टेषु गुणेष्ववस्तुदृक् । दान्तेन्द्रियप्राणशरीरधीः सदा प्रशान्तकामो रहितासुरोऽसुरः
nodvignacitto vyasaneṣu niḥspṛhaḥ śruteṣu dṛṣṭeṣu guṇeṣvavastudṛk | dāntendriyaprāṇaśarīradhīḥ sadā praśāntakāmo rahitāsuro'suraḥ
SB 7.4.33