Srimad Bhagavatam Canto 10, Chapter 82, Text 45

SB 10.82.45

aham hi sarva-bhutanam
 adir anto ’ntaram bahih
bhautikanam yatha kham var
 bhur vayur jyotir anganah
 
Translation: 
 
Dear ladies, I am the beginning and end of all created beings and exist both within and without them, just as the elements ether, water, earth, air and fire are the beginning and end of all material objects and exist both within and without them.
 
Purport: 
 
According to Srila Sridhara Svami and Srila Visvanatha Cakravarti, Lord Krsna implies the following idea in this verse: “If you know that I am the Supreme Lord, there should be no question of your suffering any separation from Me, since I pervade all existence. Your unhappiness must be due to a lack of discrimination. Therefore please take this instruction from Me, which will remove your ignorance.
 
“But the truth of the matter is that you gopis were in your previous lives great masters of yoga, and thus you must already know this science of jñana-yoga. Furthermore, whether I try to teach this to you in person or through My representative, such as Uddhava, it will not produce the desired result. Jñana-yoga simply causes suffering for those who are fully immersed in pure love of Godhead.”
Srimad Bhagavatam Canto 10, Chapter 82, Text 44
Srimad Bhagavatam Canto 10, Chapter 82, Text 46