St. Benedict

We believe that the divine presence is everywhere and that “the
eyes of the Lord are looking on the good and the evil in every
place.” But we should believe this especially without any doubt
when we are assisting at the Work of God. To that end let us be
mindful always of the Prophet’s words, “Serve the Lord in fear”
and again, “Sing praises wisely” and “In the sight of the Angels I
will sing praise to Thee.” Let us therefore consider how we ought
to conduct ourselves in the sight of the Godhead and of His
Angels, and let us take part in the psalmody in such a way that
our mind may be in harmony with our voice.