the following is written by Maria Pia Giudici

The Angels: Spiritual and Exegetical Notes
“Wherever innocence is most oppressed and trampled upon is precisely where the angels are likely to intervene. But also wherever correction or punishment is called for, the angels are likewise apt to be present… They represent the two characteristic faces of the heavens at one and the same time; they are either suffused with sunlight or dark with menacing clouds; in either case the help they send down upon the earth is always beneficial.”