Srimad Bhagavatam Canto 11, Chapter 14, Text 27

SB 11.14.27

visayan dhyayatas cittam
 visayesu visajjate
mam anusmaratas cittam
 mayy eva praviliyate
 
Translation: 
 
The mind of one meditating upon the objects of sense gratification is certainly entangled in such objects, but if one constantly remembers Me, then the mind is absorbed in Me.
 
Purport: 
 
One should not think that one can attain complete transcendental knowledge of Krsna by mechanically engaging in worship of the Lord. Lord Krsna states here that one must endeavor constantly to keep the Lord within one’s mind. Anusmaratah, or constant remembrance, is possible for one who always chants and hears the glories of Lord Krsna. It is therefore stated, sravanam, kirtanam, smaranam: the process of devotional service begins with hearing (sravanam) and chanting (kirtanam), from which remembrance (smaranam) develops. One who constantly thinks of the objects of material gratification becomes attached to them; similarly, one who constantly keeps Lord Krsna within his mind becomes absorbed in the Lord’s transcendental nature and thus becomes qualified to render personal service to the Lord in His own abode.
Srimad Bhagavatam Canto 11, Chapter 14, Text 26
Srimad Bhagavatam Canto 11, Chapter 14, Text 28