“We should be very attentive and not let our attention waver when we’re chanting the holy names. And as Prabhupada states in the purport, it’s a very heavy statement, “If one’s mind is distracted from worship, a mere show of worship will not be of any benefit.” In other words – putting it in language you may understand – if your mind is thinking of something else what is the benefit of that? You should be focused on the holy names while you’re chanting the holy names to avoid the offenses.”
Bir Krsna Goswami
Lecture SB 5.8.14
New Goloka January 1, 2013