|Canto 4: Creation of the Fourth Order||Chapter 19: King Pṛthu's One Hundred Horse Sacrifices|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 4.19.37
bhavān paritrātum ihāvatīrṇo
dharmaḿ janānāḿ samayānurūpam
venāpacārād avaluptam adya
tad-dehato viṣṇu-kalāsi vainya
bhavān — Your Majesty; paritrātum — just to deliver; iha — in this world; avatīrṇaḥ — incarnated; dharmam — religious system; janānām — of the people in general; samaya-anurūpam — according to the time and circumstances; vena-apacārāt — by the misdeeds of King Vena; avaluptam — almost vanished; adya — at the present moment; tat — his; dehataḥ — from the body; viṣṇu — of Lord Viṣṇu; kalā — part of a plenary portion; asi — you are; vainya — O son of King Vena.
O King Pṛthu, son of Vena, you are the part-and-parcel expansion of Lord Viṣṇu. Due to the mischievous activities of King Vena, religious principles were almost lost. At that opportune moment you descended as the incarnation of Lord Viṣṇu. Indeed, for the protection of religious principles you have appeared from the body of King Vena.
The way in which Lord Viṣṇu kills the demons and protects the faithful is mentioned in Bhagavad-gītā (4.8):
vināśāya ca duṣkṛtām
sambhavāmi yuge yuge
"In order to deliver the pious and to annihilate the miscreants, as well as to reestablish the principles of religion, I advent Myself millennium after millennium."
In two hands Lord Viṣṇu always carries a club and a cakra to kill demons, and in His other two hands He holds a conchshell and a lotus to give protection to His devotees. When His incarnation is present on this planet or in this universe, the Lord kills the demons and protects His devotees simultaneously. Sometimes Lord Viṣṇu appears in His person as Lord Kṛṣṇa or Lord Rāma. All of these appearances are mentioned in the śāstras. Sometimes He appears as a śaktyāveśa-avatāra like Lord Buddha. As explained before, these śaktyāveśa-avatāras are incarnations of Viṣṇu's power invested in a living entity. Living entities are also part and parcel of Lord Viṣṇu, but they are not as powerful; therefore when a living entity descends as an incarnation of Viṣṇu, he is especially empowered by the Lord.
When King Pṛthu is described as an incarnation of Lord Viṣṇu, it should be understood that he is a śaktyāveśa-avatāra, part and parcel of Lord Viṣṇu, and is specifically empowered by Him. Any living being acting as the incarnation of Lord Viṣṇu is thus empowered by Lord Viṣṇu to preach the bhakti cult. Such a person can act like Lord Viṣṇu and defeat demons by arguments and preach the bhakti cult exactly according to the principles of śāstra. As indicated in Bhagavad-gītā, whenever we find someone extraordinary preaching the bhakti cult, we should know that he is especially empowered by Lord Viṣṇu, or Lord Kṛṣṇa. As confirmed in Caitanya-caritāmṛta (Antya 7.11), kṛṣṇa-śakti vinā nahe tāra pravartana: one cannot explain the glories of the holy name of the Lord without being specifically empowered by Him. If one criticizes or finds fault with such an empowered personality, one is to be considered an offender against Lord Viṣṇu and is punishable. Even though such offenders may dress as Vaiṣṇavas with false tilaka and mālā, they are never forgiven by the Lord if they offend a pure Vaiṣṇava. There are many instances of this in the śāstras.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness