Whether angels grieve for the ills of those whom they guard?

Objections

Objection 1 : It would seem that angels grieve for the ills of those whom they guard. For it is written (Is. 33:7): "The angels of peace shall weep bitterly." But weeping is a sign of grief and sorrow. Therefore angels grieve for the ills of those whom they guard.
Objection 2 : Further, according to Augustine (De Civ. Dei xiv, 15), "sorrow is for those things that happen against our will." But the loss of the man whom he has guarded is against the guardian angel's will. Therefore angels grieve for the loss of men.
Objection 3 : Further, as sorrow is contrary to joy, so penance is contrary to sin. But angels rejoice about one sinner doing penance, as we are told, Lk. 15:7. Therefore they grieve for the just man who falls into sin.
Objection 4 : Further, on Numbers 18:12: "Whatsoever first-fruits they offer," etc. the gloss of Origen says: "The angels are brought to judgment as to whether men have fallen through their negligence or through their own fault." But it is reasonable for anyone to grieve for the ills which have brought him to judgment. Therefore angels grieve for men's sins.