Legend says the St. Gregory The good (d. 604) heard the 1st three traces chanted by angels on a certain Easter early morning in Rome even though he walked barefoot in a fantastic spiritual procession and that the saint thereupon added the fourth line: “Ora Professional nobis Deum. Alleluia.” Almighty, https://alexisuafjn.blogsvirals.com/30549256/5-simple-statements-about-vita-pro-nobis-explained