St. Paul the Most Simple lived in the fourth century. He is called the most simple for his simplicity and kindness. The monk was married, but upon learning of his wife's infidelity, he left her and retired to the desert to St. Anthony the Great. Paul was already 60 years old, and St. Anthony at first did not accept Paul, considering him incapable of a difficult hermit's life. Pavel stood outside the ascetic's cell for three days, saying that he would rather die than leave here. 
Then St. Anthony settled Paul in his home, and for a long time he tested his patience and humility with hard work, severe fasting, night vigils, relentless singing of psalms and prostrations to the ground. Finally, St. Anthony allowed Paul to settle in a separate cell.
For his many years of heroic deeds, the Lord granted St. Paul clairvoyance and the power to cast out demons. When a young man possessed with demons was brought to St. Anthony, he sent the sick man to St. Paul with the words: "The great in faith can cast out only small demons, but the humble, like Paul the Most Simple, have power over the princes of demons."