(iv)
They warn us of upcoming spiritual dangers.
(v)
They admonish us when we have sinned.
(vi)
They unite their prayers with ours and offer them up to God.
(vii)
They defend us at the hour of death against the last attacks of the
demons.
(viii)
They console the souls in purgatory and conduct them to heaven
after they have expiated their sins.
In Scripture, the doctrine of Guardian Angels is given no special
consideration, but, is rather taken for granted:
The two angels came to Sodom in the evening, and Lot was sitting in the
gateway of Sodom. When Lot saw them, he rose to meet them, and bowed
down with his face to the ground ... When morning dawned, the angels
urged Lot, saying, Get up, take your wife and your two daughters who are
here, or else you will be consumed in the punishment of the city (Gen.
19:1-15).
Behold, I send an angel before you, to guard you on the way and to bring
you to the place which I have prepared. Give heed to him and hearken to
his voice, do not rebel against him, for he will not pardon your
transgression; for my name is in him (Exod. 23:20-21).
But now go, lead the people to the place about which I have spoken to
you; see, my angel shall go in front of you. Nevertheless, when the day
comes for punishment, I will punish them for their sin (Exod. 32:34).
The prayer of both was heard in the presence of the glory of the great
God. And Raphael was sent to heal the two of them (Tob. 3:16-17).
The angel of the Lord encamps around those who fear him, and delivers
them (Ps. 34:7 [33:8]).
For he will command his angels concerning you to guard you in all your
ways (Ps. 91[90]:11).