The Angels Our Companions
Francis venerated most affectionately the angels who are with us on the field of battle and who walk with us in the midst of the shadow of death. We should venerate these companions, he would say, who are with us everywhere, and we should call upon them as our guardians. He used to teach that we should not offend their presence by doing in their sight what we would not do before people.
-- Celano, Second Life, 197