Srimad Bhagavatam Canto 11, Chapter 22, Text 43

SB 11.22.43

nityada hy anga bhutani
 bhavanti na bhavanti ca
kalenalaksya-vegena
 suksmatvat tan na drsyate
 
Translation: 
 
My dear Uddhava, material bodies are constantly undergoing creation and destruction by the force of time, whose swiftness is imperceptible. But because of the subtle nature of time, no one sees this.
Srimad Bhagavatam Canto 11, Chapter 22, Text 42
Srimad Bhagavatam Canto 11, Chapter 22, Text 44