Summa Theologica - Part I Q109-114: The Ordering of the Bad Angels - Of the Assaults of the Demons

The Summa Theologica (or the Summa Theologiae or simply the Summa, written 1265–1274) is the most famous work of Thomas Aquinas although it was never finished. It was intended as a manual for beginners as a compilation of all of the main theological teachings of that time. It summarizes the reasonings for almost all points of Christian theology in the West, which, before the Protestant Reformation, subsisted solely in the Roman Catholic Church. The Summa's topics follow a cycle: the existence of God, God's creation, Man, Man's purpose, Christ, the Sacraments, and back to God. (Summary adapted from the Wikipedia)

 109. The Ordering of the Bad Angels

 110. How Angels Act on Bodies

 111. The Action of the Angels on Man

 112. The Mission of the Angels

 113. Of the Guardianship of the Good Angels

 114. Of the Assaults of the Demons