Just like Prahlāda Mahārāja. Nṛsiṁha-deva appeared not to kill his teeny father. To kill his teeny father . . . simply by directing the māyā, he could be killed. But He wanted to come before Prahlāda Mahārāja, that "You are My such nice devotee. You are suffering for Me. Now I have come. You see." This is the purpose. By the by, to kill the atheist, keeping the promise of Brahmā intact . . . he took benediction from Brahmā that, "I shall not die in this way and this way, this way." All the promises of Brahmā kept. He appeared in such a form that it will not clash with the promise of Brahmā. Therefore He had to take the form of such a thing which does not clash with the promise.
Brahmā was a devotee. He has given him some benediction. So Kṛṣṇa did not violate that. It must be kept. Kaunteya pratijānīhi na me bhaktaḥ praṇaśyati (BG 9.31). Just see kindness of Kṛṣṇa. He kept Brahmā's promise, He kept the atheist Hiraṇyakaśipu's aspiration, and He satisfied Prahlāda. And everything was done simply by incarnating as Narasiṁhadeva. This is Kṛṣṇa's plan. He comes, but by one stroke, He serves so many business. That is Kṛṣṇa.
So here is also, Lord Rāmacandra appeared. The main business was to kill Rāvaṇa. Not main business. Main business is to satisfy the devotee; side by side, to kill Rāvaṇa. And Rāvaṇa was on the other side of Indian Ocean. So Hanumān, a devotee of Rāmacandra, he jumped over the ocean simply by chanting, "Jaya Rāma." You see? But Rāmacandra thought Himself that He is unable to jump over. He had to construct a bridge. You see? But what kind of bridge? Bridge, a stone bridge that was floating on the sea. The law of gravitation did not work.
That is God. He can nullify any law. He can introduce any new law. And nobody has got experience that stone thrown on the water floating. No one has got . . . naturally, it goes down. But this is God, that He nullifies the general law, as He desires. Sarva-śakti-sampannaḥ. That is all-powerful. That is greatness. Not that if you have got a small body and the elephant has got a very big body, therefore he is great. No. That is not greatness. The elephant, in spite of having such a big body and thousand times stronger than the human being, he is controlled by a small human being.