If one has devotion, why does one need to count the names of God?

From: Ganesh :
There is a saying, ” Dhyani ko mala karte dekh Premi ne kaha ‘Ye to bhagwan ka naam bhi ginkar lete hain or fir kahte hain ki unhe bhagwan se prem hai.’ Once I was chanting on my bids. My non devotee sister was sitting nearby me. Than she also quoted the above mentioned saying & laughed at me. What should be our answer to such people? Prabhuji, can you simplify it with an example?