Sarva. Sarva means whatever you can think, everything is coming from . . . if you think for the time being about the sun, what is the sun? The sun is also coming from Him. Sarvam. Sarvam means including everything. Sarvam ahaṁ sarvasya prabhavaḥ. He is the origin of Brahmā. Generally, we think Brahmā has created. Brahmā is also created by Him.
Lord Śiva is also created by Him. Because from Brahmā, Rudra . . . Rudra is stated to be the son of Brahmā. So Brahmā is the son, or born out of the lotus flower from the abdomen of Viṣṇu. Viṣṇu is expansion of Kṛṣṇa. In this way Kṛṣṇa is the origin of everything. That is a fact.
That is the verdict of all Vedic literature. Yasmin vijñāte sarvam idaṁ vijñātaṁ bhavati (Muṇḍaka Upaniṣad 1.3).
If you can understand the origin person, Kṛṣṇa, then everything will come to your knowledge. Everything will be understood: how everything is existing, how they are appearing, how they are disappearing, how they are existing. Everything will be known.
So Prahlāda Mahārāja, he was very much tortured by his father because he was a devotee. That is the function of the non-devotees: to tease the devotees. That is not very new thing. That is old. Even the father. So when he was too much teased, then Lord appeared in Nṛsiṁha mūrti to kill the demon, and He was very much angry. You see? Even a neighbor's child, if he is tortured by his father, you will be angry, that "Why you are torturing this little child?" And what to speak of Kṛṣṇa? And especially His devotee, Prahlāda Mahārāja, was being tortured.