Lord Kṛṣṇa says in Bhagavad-gītā (10.41) :

yad yad vibhūtimat sattvaṁ śrīmad ūrjitam eva vā tat tad evāvagaccha tvaṁ mama tejo-’ṁśa-sambhavam

“Know that all beautiful, glorious and mighty creations spring from but a spark of My splendor.” This is confirmed by Prahlāda Mahārāja. If one sees extraordinary strength or power anywhere, it is derived from the Supreme Personality of Godhead. To give an example, there are different grades of fire, but all of them derive heat and light from the sun. Similarly, all living entities, big or small, are dependent on the mercy of the Supreme Personality of Godhead. One’s only duty is to surrender, for one is a servant and cannot independently attain the position of master. One can attain the position of master only by the mercy of the master, not independently. Unless one understands this philosophy, he is still a mūḍha; in other words, he is not very intelligent. The mūḍhas, the asses who do not have this intelligence, cannot surrender unto the Supreme Personality of Godhead.

Understanding the subordinate position of the living entity takes millions of births, but when one is actually wise he surrenders unto the Supreme Personality of Godhead. The Lord says in Bhagavad-gītā (7.19) :

bahūnāṁ janmanām ante jṣānavān māṁ prapadyate vāsudevaḥ sarvam iti sa mahātmā sudurlabhaḥ

“After many births and deaths, he who is actually in knowledge surrenders unto Me, knowing Me to be the cause of all causes and all that is. Such a great soul is very rare.” Prahlāda Mahārāja was a great soul, a mahātmā, and therefore he completely surrendered unto the lotus feet of the Lord. He was confident that Kṛṣṇa would give him protection under all circumstances.