Overcoming Sin:

Old habits of sin can come back and haunt people; these severe crosses test us but can be borne just like any other cross.…God leads us through these trials so that we learn to trust Him more, to love Him more and to seek Him with holy longing.

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You should be aware that the word "angel" denotes a function rather than a nature. Those holy spirits of heaven have indeed always been spirits. They can only be called angels when they deliver some message. Moreover, those who deliver messages of lesser importance are called angels; and those who proclaim messages of supreme importance are called archangels. Raphael means God's remedy, Michael is sent whenever some act of wondrous power must be performed, and Gabriel is called God's strength because he was sent to Mary.

- Pope St. Leo the Great