Mbh 12.238.1b

Analysing desire and aversion, they worship only penance.[940] Devoted to the practice of penances, steadfast in them, and rigid in their observance, one obtains the fruition of all desires by penances alone. By penance one attains to that by becoming which one creates the universe. By penance one becomes that in consequence of which one becomes the puissant master of all things.[941] That Brahma has been expounded in the declarations of the Vedas. For all that, Brahma is inconceivable by even those that are conversant with those declarations. Once more has Brahma been declared in the Vedanta. Brahma, however, cannot be beheld by means of acts.[942] The sacrifice ordained for Brahmans consists in japa (meditation and recitation), that for Kshatriyas consists in the slaughter of (clean) animals for the gratification of the deities; that for Vaisyas consists in the production of crops and the keep of domestic animals; and that for Sudras in menial service of the three other orders. By observing the duties laid down for him and by studying the Vedas and other scriptures, one becomes a Dwija (regenerate). Whether one does any other act or not, one becomes a Brahmana by becoming the friend of all creatures.[943] In the beginning of Treta, the Vedas and sacrifices and the divisions of caste and the several modes of life existed in their entirety. In consequence, however, of the duration of life being decreased in Dwapara, those are overtaken by decline. In the Dwapara age as also in the Kali, the Vedas are overtaken by perplexity. Towards the close of Kali again, it is doubtful if they ever become even visible to the eye.[944] In that age, the duties of the respective order disappear, and men become afflicted by iniquity. The juicy attributes of kine, of the earth, of water, and (medicinal and edible) herbs, disappear.