They (Uttanapada and Priyavrata) were very competent to rule the universe to maintain and protect the citizens because both of them were descendants of a plenary expansion of Vasudeva, the Supreme Personality of Godhead

Expressions researched:
"Because both of them were descendants of a plenary expansion of Vāsudeva, the Supreme Personality of Godhead, they were very competent to rule the universe to maintain and protect the citizens"

Srimad-Bhagavatam

SB Canto 4

Because both of them were descendants of a plenary expansion of Vāsudeva, the Supreme Personality of Godhead, they were very competent to rule the universe to maintain and protect the citizens.

SB 4.8.7, Translation and Purport

Svāyambhuva Manu had two sons by his wife, Śatarūpā, and the names of the sons were Uttānapāda and Priyavrata. Because both of them were descendants of a plenary expansion of Vāsudeva, the Supreme Personality of Godhead, they were very competent to rule the universe to maintain and protect the citizens.

It is said that these two kings, Uttānapāda and Priyavrata, were specifically empowered by the Supreme Personality of Godhead, unlike the great King Ṛṣabha, who was the Supreme Personality of Godhead Himself.