This work by St. Anselm explores theological concepts surrounding the nature of good and evil, particularly in the context of angels and their free will. It argues that all beings receive their essence from God, who is the source of all goodness. The text examines why the devil fell, suggesting that he lacked perseverance because it was not granted by God. It also delves into the nature of justice and injustice, the reasons behind the inability of fallen angels to return to righteousness, and the inherent goodness of the will. Ultimately, it asserts that evil is the absence of good, rather than a tangible entity.