Verse 20

एवं हि नियतिर्देवी निश्चिता पारमेश्वरी ।प्रह्लादेन यथाकल्पं स्थातव्यमिह देहिना

In plain words

For thus indeed is the divine Niyati of the Supreme Lord fixed and certain: that Prahlāda, as an embodied one, must remain here for the span of the kalpa.