Since original sin is ascribed to the instigation of the devil: "By the envy of the devil, death came into the world" (Wisdom of Solomon 2), and according to Saint Paul (Ephesians 6), the evil spirits are the most dangerous enemies of our souls, the real powers of evil in the world are the fallen angels. Hence evil men, living in sin, are said to be slaves of, or in the power of Satan; and other evils so-called, such as calamities, sickness, and the like, are often due to the same powers of evil.