The great sage Vyāsadeva saw anomalies in the duties of the millennium. This happens on the earth in different ages, due to the unseen force of time.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
परावरज्ञः स ऋषिः कालेनाव्यक्तरंहसा । युगधर्मव्यतिकरं प्राप्तं भुवि युगे युगे
parāvarajñaḥ sa ṛṣiḥ kālenāvyaktaraṃhasā | yugadharmavyatikaraṃ prāptaṃ bhuvi yuge yuge
SB 1.4.16