- Do all the angels belong to one hierarchy?
- In one hierarchy, is there only one order?
- In one order, are there many angels?
- Is the distinction of hierarchies and orders natural?
- The names and properties of each order
- The comparison of the orders to one another
- Will the orders outlast the Day of Judgment?
- Are men taken up into the angelic orders?
"It is because the contemporary alternatives seem so one-sided and are not more evidently solutions to the problems which Thomas faced, and partly solved, that we return to him and to the tradition of theology and philosophy in which his Summa Theologiae appears: theology as the science of the first principle and this as the total knowledge of reality in its unity." -- Wayne J. Hankey, God in Himself (Oxford University Press, 1987), p.159.