Angels Fly by Day and Night

Most of us have surely entertained angels unaware.

Very seldom is it made obvious our encounters were angelic being(s). Just as often it isn't obvious when a liar or the father of lies is standing beside us whispering. It is only when we consider the lie and respond by our flesh that sin takes hold and we experience separation from the Father, Jesus and the Helper.
In Acts, Peter's encounter with an angel was made obvious after he was released from prison. I imagine the angel of the Lord striking Peter on the side just enough to awaken him from his deep sleep; the prison dim, yet lit enough for Peter to see and quiet enough not to awaken the guards. The release of shackles- silent, Peter's movements calm and the gates didn't creak as they opened. Therefore, Peter didn't realize he wasn't seeing a vision until he "came to his senses," ie., the night air, smells and sounds of the late evening hour in the street outside.
The known encounters Tom and I have had with an angel(s) were made known upon their disappearance when we weren't looking. Occasionally, there may have been a strong sense but most often we are all unaware. Remember:
Angels outnumber the liars by 3-1.
God's angels that are deployed here are commissioned visitors to this realm; messengers, guardians, servants and keepers of the will of God (to name a few).

With so much awareness of the evil around us, and it's prevalence in our world, let's remember, we have a great crowd of onlookers, witnesses, that we are fighting this fight before. Sometimes, angels are much more difficult to recognize because most my encounters have been ordinary people, many transient looking, but we have surely entertained angels unaware.