Srimad Bhagavatam Canto 12, Chapter 04, Text 37

SB 12.4.37

anady-antavatanena
 kalenesvara-murtina
avastha naiva drsyante
 viyati jyotisam iva
 
Translation: 
 
These stages of existence created by beginningless and endless time, the impersonal representative of the Supreme Lord, are not visible, just as the infinitesimal momentary changes of position of the planets in the sky cannot be directly seen.
 
Purport: 
 
Although everyone knows that the sun is constantly moving in the sky, one cannot normally see the sun moving. Similarly, no one can directly perceive his hair or nails growing, although with the passing of time we perceive the fact of growth. Time, the potency of the Lord, is very subtle and powerful and is an insurmountable barrier to fools who are trying to exploit the material creation.
Srimad Bhagavatam Canto 12, Chapter 04, Text 36
Srimad Bhagavatam Canto 12, Chapter 04, Text 38