Summa Theologica - Part I Q51-57: Of the Angels in Comparison with Bodies - Of the Angels' Knowledge of Material Things

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)

 51. Of the Angels in Comparison with Bodies

 52. Of the Angels in Relation to Place

 53. Of the Local Movement of the Angels

 54. Of the Knowledge of the Angels

 55. Of the Medium of the Angelic Knowledge

 56. Of the Angels' Knowledge of Immaterial Things

 57. Of the Angels' Knowledge of Material Things