Srimad Bhagavatam Canto 10, Chapter 32, Text 07

 SB 10.32.7

aparanimisad-drgbhyam
 jusana tan-mukhambujam
apitam api natrpyat
 santas tac-caranam yatha
 
Translation: 
 
Another gopi looked with unblinking eyes upon His lotus face, but even after deeply relishing its sweetness She did not feel satiated, just as mystic saints are never satiated when meditating upon the Lord’s feet.
 
Purport: 
 
Srila Visvanatha Cakravarti Thakura explains that the analogy given here of saintly persons meditating upon the Lord’s feet is only partially applicable, since the ecstasy the gopis felt when Krsna came back was actually unparalleled. Srila Visvanatha Cakravarti also reveals that this particular gopi is the most fortunate of all, Srimati Radharani.
Srimad Bhagavatam Canto 10, Chapter 32, Text 06
Srimad Bhagavatam Canto 10, Chapter 32, Text 08