In the Padma Purāṇa this story is there. He was habituated to kill animals. Vyādha, you know, hunter. So he was killing so many animals half-dead. So Nārada Muni was passing through that forest, he was very much aggrieved, "Who is this rascal, killing these animals half, and they are flapping out of painful condition? Let me see this rascal." So he searched out this vyādha, hunter. The vyādha was very busy in his hunting. So he thought . . . because, after all, Nārada Muni is a Vaiṣṇava, after seeing him personally his heart was immediately little clarified. So he offered respect, "Sir, you have come here for some tiger skin or deerskin. I shall give you, but don't disturb in my business. Please let me do my business."
So Nārada Muni said: "All right, you do your business, but one thing I request—why you are not killing these animals all at a time? Why you are killing half? It is great sin." Then it stuck to his brain, "Sin? Oh. What is this sin?" Then he described the effects of sin. Then he said: "I have been taught by my father to do this business. So if I do not do this business, how shall I live?" So Nārada Muni said: "If I guarantee your living, would you give it up this business, this profession?" "Why not? If I get my living means, then I can give up." So it was agreed that he will give up his business of hunting. And Nārada Muni said that, "I will give you all necessities of your life. Come on."
So it is a long story. I am making shortcut. So Nārada Muni asked him that, "You sit down on this bank of Ganges, and here is the tulasī plant. You worship it, and I will send your food. Don't be worried." So next morning it was declared in the village, "That heinous hunter has become a Vaiṣṇava." So people, generally, they are inquisitive. They came to see. It is the custom when you go to see a saintly person, you take some fruits or flowers or some rice or some āṭā. So huge stack of rice and āṭā and fruits and flowers also. They were surprised, "Why Nārada Muni is sending so much? We are simply husband and wife." In this way they become Vaiṣṇava. And after some time Nārada Muni, with his friend Parvata Muni, he wanted to see his devotee.
So he asked Parvata Muni that, "My dear friend, will you come with me? I shall show my devotee who was formerly a hunter." So Parvata Muni knew that, "You can play wonderful. So let me see this devotee." So when Nārada Muni was coming, this devotee was going to receive the spiritual master. This is the custom, to receive the spiritual master from distant place with all honor by bowing down. But he was jumping. He was jumping. So when he came near, the Parvata Muni first of all asked him, "My dear son, you are great devotee, but while coming here why you are jumping?" He said that, "On the ground there are so many ants, sir. So I do not want to kill these ants."
This is the effect of devotional service. The same man who was taking pleasure by killing one animal half-dead, he is not prepared to kill even an ant. This is called bhakti. Yasyāsti bhaktir bhagavaty akiñcanā sarvair guṇais tatra samāsate surāḥ (SB 5.18.12). If one becomes a devotee of the Lord, akiñcana-bhakti, then sarvair guṇaiḥ, all good qualities will come out automatically. Because every living entity is part and parcel of God. God is all-good. Therefore every living entity potentially, constitutionally, he is also good. As God is good, we are also good. But due to our material association, we have become bad. So if we revive our old position, Kṛṣṇa consciousness, then automatically we shall become all-good. This is Kṛṣṇa consciousness movement.