Vishnupurana 6.2.14

6.2.14

ity ukto munibhir vyāsaḥ prahasyedam athābravīt
śrūyatāṃ bho muniśreṣṭhā yad uktaṃ sādhu sādhv iti //

Being thus addressed by the Munis, Vyása smiled, and said to them, "Hear, excellent sages, why I uttered the words 'Well done, well done.' The fruit of penance, of continence, of silent prayer, and the like, practised in the Krita age for ten years, in the Treta for one year, in the Dwápara for a month, is obtained in the Kali age in a day and night: therefore did I exclaim, 'Excellent, excellent, is the Kali age!' That reward which a man obtains in the Krita by abstract meditation, in the Treta by sacrifice, in the Dwápara by adoration, he receives in the Kali by merely reciting the name of Keśava. In the Kali age a man displays the most exalted virtue by very little exertion; therefore, pious sages, who know what virtue is, I was pleased with the Kali age. Formerly the Vedas were to be acquired by the twice-born through the diligent observance of self-denial; and it was their duty to celebrate sacrifices conformably to the ritual. Then idle prayers, idle feasts, and fruitless ceremonies, were practised but to mislead the twice-born; for although observed by them devoutly, yet, in consequence of some irregularity in their celebration, sin was incurred in all their works, and what they ate, or what they drank, did not effect the fulfilment of their desires. In all their objects the twice-born enjoyed no independence, and they attained their respective spheres only with exceeding pain. The Śúdra, on the contrary, more fortunate than they, reaches his assigned station by rendering them service, and performing merely the sacrifice of preparing food, in which no rules determine what may or may not be eaten, what may or may not be drunk. Therefore, most excellent sages, is the Śúdra fortunate.