SB 10.80.3
sa vag yaya tasya gunan grnite
karau ca tat-karma-karau manas ca
smared vasantam sthira-jangamesu
srnoti tat-punya-kathah sa karnah
Translation:
Actual speech is that which describes the qualities of the Lord, real hands are those that work for Him, a true mind is that which always remembers Him dwelling within everything moving and nonmoving, and actual ears are those that listen to sanctifying topics about Him.
Purport:
While continuing from the previous verse to glorify the sense of hearing dedicated to the Lord, King Pariksit mentions the other senses also, so that we gain a complete picture of Krsna consciousness. Here he declares that without any connection to Krsna, the Supreme Lord, all the organs of the body become useless. A similar statement is made by Saunaka Rsi in the Second Canto, Third Chapter, verses 20 to 24.
Srila Visvanatha Cakravarti mentions that the senses should work together in Krsna consciousness. In other words, whatever the eyes or the ears experience, the mind should simply remember Krsna, who is within all things.