What is man that you are mindful of him, . . . You made him a little lower than the heavenly beings and crowned him with glory and honor. Angels can appear in the form of ordinary people. Do not forget to entertain strangers, for by so doing some people have entertained angels without knowing it. And now Christ is in heaven, sitting in the place of honor next to God the Father, with all the angels and powers of heaven bowing before him and obeying him.
Angels are special guardians.
Beware that you don't look down upon a single one of these little children. Angels provide protection. Angels rescue from danger. For the angel of the Lord guards and rescues all who reverence him. Angels carry out God's orders.