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Śrīmad-Bhāgavatam
[Canto 9, Ch. 1]
bhagavan kim idam jātam karma vo brahma-vādinām viparyayam aho kaṣṭam maivam syād brahma-vikriyā
bhagavan—O my lord; kim idam—what is this; jātam—born; karma—fruitive activities; vaḥ—of all of you; brahma-vādinām—of you, who are expert in chanting the Vedic mantras; viparyayam—deviation; aho—alas; kaṣṭam—painful; mā evam syāt—thus it should not have been; brahma-vikriyā—this opposite action of the Vedic mantras.
TRANSLATION
My lord, all of you are expert in chanting the Vedic mantras. How then has the result been opposite to the one desired? This is a matter for lamentation. There should not have been such a reversal of the results of the Vedic mantras.
PURPORT
In this age, the performance of  yajña  has been forbidden because no one can properly chant the Vedic  mantras . If Vedic  mantras  are chanted properly, the desire for which a sacrifice is performed must be successful. Therefore the Hare Kṛṣṇa chant is called the  mahā-mantra , the great, exalted  mantra  above all other Vedic  mantras , because simply chanting the Hare Kṛṣṇa  mahā-mantra  brings so many beneficial effects. As explained by Śrī Caitanya Mahāprabhu (Śikṣāṣṭaka 1):
ceto-darpaṇa-mārjanam bhava-mahā-dāvāgni-nirvāpaṇam śreyaḥ-kairava-candrikā-vitaraṇam vidyā-vadhū-jīvanam ānandāmbudhi-vardhanam prati-padam pūrṇāmṛtāsvādanam sarvātma-snapanam param vijayate śrī-kṛṣṇa-saṅkīrtanam
“Glory to the Śrī Kṛṣṇa  saṅkīrtana , which cleanses the heart of all the dust accumulated for years and extinguishes the fire of conditional life, of repeated birth and death. This  saṅkīrtana  movement is the prime benediction for humanity at large because it spreads the rays of the