Each angel is created for a specific purpose within the cosmos.
https://aleteia.org/2017/09/28/the-9-ch ... em-by-god/
9 choirs of angels and the roles given them by God
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9 choirs of angels and the roles given them by God
Devotion to the souls in Purgatory contains in itself all the works of mercy, which supernaturalized by a spirit of faith, should merit us Heaven. de Sales