There are two kinds of people who sing in the church.

Those who concentrate on the words and their meanings.
And those who concentrate on how well they sing.

Most of the time, you can easily tell them apart, because the first group is bestowed with Holy Spirit when their minds become filled with God, and their voice although average has a mysterious resonance of holiness.

While the second group - their voice may sound nice, but it's dry and sounds automatic without any feelings or emotions that you usually hear in every human's voice.