[Nārada Muni had spoken of a physical object made of sharp blades and thunderbolts. The Haryaśvas understood this allegory as follows.] Eternal time moves very sharply, as if made of razors and thunderbolts. Uninterrupted and fully independent, it drives the activities of the entire world. If one does not try to study the eternal element of time, what benefit can he derive from performing temporary material activities?
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कालचक्रं भ्रमिस्तीक्ष्णं सर्वं निष्कर्षयज्जगत् । स्वतन्त्रमबुधस्येह किमसत्कर्मभिर्भवेत्
kālacakraṃ bhramistīkṣṇaṃ sarvaṃ niṣkarṣayajjagat | svatantramabudhasyeha kimasatkarmabhirbhavet
SB 6.5.19