Śrīmad-Bhāgavatam and bhāgavata-dharma are meant for persons who are completely free of envy (parama-nirmatsarāṇām). Therefore Prahlāda Mahārāja prays in this verse, khalaḥ prasīdatām: "May all the envious persons be pacified."
The material world is full of envious persons, but if one frees himself of envy, he becomes liberal in his social dealings and can think of others' welfare. Anyone who takes up Kṛṣṇa consciousness and engages himself completely in the service of the Lord cleanses his mind of all envy (manas ca bhadram bhajatād adhokṣaje).
Therefore we should pray to Lord Nṛsiṁhadeva to sit in our hearts. We should pray, bahir nṛsiṁho hṛdaye nṛsiṁhaḥ: "Let Lord Nṛsiṁhadeva sit in the core of my heart, killing all my bad propensities. Let my mind become clean so that I may peacefully worship the Lord and bring peace to the entire world."
[SB: 5.18.9: The prayers offered to the Lord by the residents of Jumbudvipa]