Understanding Human Sin From Malice

Aquinas: If it were not for the angels being elevated to a life of grace, they would not have sinned. Because angels naturally have perfect knowledge of everything that they need to know. And we've established before that ignorance always accompanies sin so that angels would not have had any ignorance, they wouldn't have sinned full stuff. I think that understanding and Felix sin is enormously helpful for understanding human sins from malice.