Srimad Bhagavatam Canto 10, Chapter 69, Text 18

SB 10.69.18

drstam tavanghri-yugalam janatapavargam
 brahmadibhir hrdi vicintyam agadha-bodhaih
samsara-kupa-patitottaranavalambam
 dhyayams caramy anugrhana yatha smrtih syat
 
Translation: 
 
Now I have seen Your feet, which grant liberation to Your devotees, which even Lord Brahma and other great personalities of unfathomable intelligence can only meditate upon within their hearts, and which those who have fallen into the well of material existence resort to for deliverance. Please favor me so that I may constantly think of You as I travel about. Please grant Me the power to remember You.
 
Purport: 
 
Lord Krsna had asked Narada Muni, “What can We do for you?” and here Narada answers. Narada Muni is a pure devotee of Lord Krsna, and thus his request is sublime.
Srimad Bhagavatam Canto 10, Chapter 69, Text 17
Srimad Bhagavatam Canto 10, Chapter 69, Text 19