Discernment.
Before summarizing text #14, as it talks about angels and demons, mention should be made about certain videos and publications that discuss angelic appearances. How does one discern if an angel is of God or is demonic?
Humility and sobriety.
People who have died and who have returned to life note that a very quiet, humble, and sober person comes to lead them to the afterlife where they are detained in a line or waiting room before meeting the Most Holy Theotokos or Christ who judges them. In total silence, the person who guides them is unassuming and respectful. Only when asked if he is one's guardian angel, will he simply respond, "Yes." Nothing more needs to be said.
On the contrary, in books from our saints, Mt. Athos and the Desert Fathers, Lucifer frequently appears in grandeur as an "Angel of Light" who will lead one to all wisdom if one will bow down and worship him. Nevertheless, as this shapeshifter's very appearance is subject to change, deep down one feels slightly uneasy, uncertain, and confused. However, the appeal to pride prevents discernment, so either the person will not reveal this vision to one's priest or spiritual father and/or he will boast about it to others.
One of my former acquaintances told me that an Angel of Light had appeared to her while she was driving into Los Angeles in the summer of 1994. He suddenly sat down in the passenger seat beside her. As the Angel was very beautiful and bright, she thought that he must be a good angel, so she followed his instruction to execute a U turn on the freeway and head back to Santa Maria going the wrong way as he had informed her that a Big Earthquake was going to happen. This maneuver could have killed both her and countless others, but somehow she was preserved from harm, so she continued in her delusion. Once pulled over by the California Highway Patrol, she realized that something was wrong. As soon as she arrived home, she called me and told me that she would appear on KNBC Channel 4 News at 5 PM where she boasted to the world about her angelic vision. Channel 4 also reported that a total of 13 people had to be escorted off the freeway by the CHP around 3 PM for driving the wrong way. All told of a splendid Angel of Light who advised them about the Big Shaker which was to occur around 3:15 PM. None of the 13 knew each other, so the CHP did not cite them for any infraction, but said that it was obviously a case of mass hysteria as no earthquake occurred.
After the news aired, she called me back an hour later. She did not call her priest. That she could have been so easily deceived by Lucifer was a shock to her as she piously prayed morning, midday, and evening prayers. However, no significant earthquakes occurred that day, the month following, or a year afterwards. The "Big One" had failed to materialize.