Srimad Bhagavatam Canto 11, Chapter 24, Text 19

SB 11.24.19

prakrtir yasyopadanam
 adharah purusah parah
sato ’bhivyañjakah kalo
 brahma tat tritayam tv aham
 
Translation: 
 
The material universe may be considered real, having nature as its original ingredient and final state. Lord Maha-Visnu is the resting place of nature, which becomes manifest by the power of time. Thus nature, the almighty Visnu and time are not different from Me, the Supreme Absolute Truth.
 
Purport: 
 
Material nature is the energy of the Lord, Maha-Visnu is His plenary portion, and time represents the Lord’s activity. In this way, time and nature are always subservient to the Supreme Personality of Godhead, who creates, maintains and annihilates all that exists through the agency of His potencies and plenary portions. In other words, Lord Krsna is the Absolute Truth because He contains all existence within Himself.
Srimad Bhagavatam Canto 11, Chapter 24, Text 18
Srimad Bhagavatam Canto 11, Chapter 24, Text 20