Holy Rule Of Saint Benedict CHAPTER XIX Of the Manner of Reciting the Psalter

We believe that God is present everywhere and that the eyes of the Lord behold the good and the bad in every place (cf Prov 15:3). Let us firmly believe this, especially when we take part in the Work of God. Let us, therefore, always be mindful of what the Prophet saith, "Serve ye the Lord with fear" (Ps 2:11). And again, "Sing ye wisely" (Ps 46[47]:8). And, "I will sing praise to Thee in the sight of the angels" (Ps 137[138]:1). Therefore, let us consider how it becometh us to behave in the sight of God and His angels, and let us so stand to sing, that our mind may be in harmony with our voice.