Nanda Maharaja innocently thought - Perhaps this boy Krsna formerly killed all these demons, & therefore in this life they are envious & are attacking Him. But He is a fire, & they are flies, & in a fight between these two, the fire is always victorious

Expressions researched:
"Nanda Mahārāja innocently thought" |"Perhaps this boy Kṛṣṇa formerly killed all these demons, and therefore in this life they are envious and are attacking Him. But Kṛṣṇa is a fire, and they are flies, and in a fight between fire and flies, the fire is always victorious"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Nanda Mahārāja innocently thought, "Perhaps this boy Kṛṣṇa formerly killed all these demons, and therefore in this life they are envious and are attacking Him. But Kṛṣṇa is a fire, and they are flies, and in a fight between fire and flies, the fire is always victorious." Fighting is always taking place between the demons and the power of the Supreme Personality.

SB 10.11.56, Translation and Purport

Although the causes of death, the daityas, were very fierce, they could not kill this boy Kṛṣṇa. Rather, because they came to kill innocent boys, as soon as they approached they themselves were killed, exactly like flies attacking a fire.

Nanda Mahārāja innocently thought, "Perhaps this boy Kṛṣṇa formerly killed all these demons, and therefore in this life they are envious and are attacking Him. But Kṛṣṇa is a fire, and they are flies, and in a fight between fire and flies, the fire is always victorious." Fighting is always taking place between the demons and the power of the Supreme Personality. Paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām (BG 4.8). Anyone who is against the control of the Supreme Personality of Godhead must be killed, life after life. Ordinary living beings are subject to karma, but the Supreme Personality of Godhead is always victorious over the demons.