The duties set down for the Krita Yuga are of one kind. Those for the Treta are otherwise. Those for the Dwapara are different. And those for the Kali are otherwise. This is in accordance with the decline which marks every succeeding cycle.
अन्ये कृतयुगे धर्मास्त्रेतायां द्वापरेऽपरे। अन्ये कलियुगे नृणां युगह्रासानुरूपतः॥