The hosts of angels praise the good works of humanity and, because of those works, not for one hour, nor for one moment, do they cease from their praise; it sounds forth unceasingly. Now God wants the praise of the angels so that their glory will increase. To him this is pleasing, and in their praise, he wants the angels to make clear and manifest the works of the saints, for the human race is made in the image and likeness of God, and so he wants the angels to praise the works of men and women in his presence. But because the human race is supported by the help of God alone, in the same way also God wishes to be praised by humans and angels together so that their glory may be magnified.
--St. Hildegard of Bingen