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Angelic apparitions could be either metaphoric or real depending on who you ask.
"Throughout Scripture, we see numerous instances in which angels were an integral part of God’s plan. One verse alludes to the possibility of angels walking among us today: “Do not forget to show hospitality to strangers, for by so doing some people have shown hospitality to angels without knowing it” (Hebrews 13:2). The obvious reference is to Abraham, whose angelic visitors appeared to him as mere men (Genesis 18). This verse may or may not confirm that angels are indeed walking among us unawares; “have shown” is past tense, so present-day encounters are not explicitly mentioned.
There are dozens of scriptural examples of angelic encounters, so we know that God can and does use angels to accomplish certain things. What we don’t know for sure is how often angels allow themselves to be seen by people. Here are the basics about angels from the Bible: angels can instruct people (Genesis 16:9), help people (Daniel 6:22), deliver messages to people (Luke 1:35), appear in visions and dreams (Daniel 10:13), protect people (Exodus 23:20), and help carry out God’s plans.
We know that God created angels, and He uses angels in His plan. Angels have a sense of individuality, as some have names (such as Gabriel and Michael) and all have different responsibilities within the angelic hierarchy."- Are there Angels among us?
Let us not forget that the Angel Gabriel appeared to Mary at the Annunciation.
Many Catholics believe that an angel appeared to the three children of Fatima in 1916.
It is also said that St. Frances of Rome (1384-1440) was guided by an Archangel that only she could see.
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Hebrews 13:2 reflects a strong cultural injunction throughout the ancient Hellenic world. Even pagans feared offending strangers who could be gods in disguise. In Euripides' play, The Bacchae, the god Dionysis disguises himself and, through him, King Pentheus learns the consequences of inhospitality to strangers.
Had the author of Hebrews known of actual examples of people entertaining angels without knowing it, we can be sure there would have been more than a single verse placed in the middle of a whole range of scarcely related material, with no hint of evidence. We can be sure this verse this verse was simply metaphorical and intended to encourage good conduct and hospitality.