Legend suggests the St. Gregory the Great (d. 604) read the very first a few lines chanted by angels on a particular Easter morning in Rome even though he walked barefoot in a great spiritual procession and which the saint thereupon extra the fourth line: “Ora Professional nobis Deum. Alleluia.” https://doresnosnervos73838.blogunok.com/31367918/the-2-minute-rule-for-vita-pro-nobis