There is a parable in the Gospels about a woman who lost a coin, so left all the nine other coins she owned to look for this lost one. The Holy Fathers of our Church saw that the nine coins in this parable represent the nine principalities that stayed within their paternal house living in the Divine Glory. The tenth coin symbolizes humanity who was lost and was reclaimed by God. Man then is the tenth coin, or the tenth angelic principality. You are an angel, a Son of the Most High, and a sanctified one.
Man is the confidant of angels.
The bright angel Lucifer fell by choosing evil as its way. Let us stand upright for evil has entered the world for the first time in the history of Creation. And it is up to these free beings to stand upright and be watchful, choosing the good instead of evil. Lucifer was the brightest angel in glory, but he became prideful over God. Being a secondary light, it wanted to become the primary light, unwilling to have its life drawn from the Giver of Life.