FTP, name this massive work by Thomas Aquinas.
Sections of this philosophical work include "Of Heresy," "Of the Priesthood of Christ," "The Immutability of God," and "Of the Substance of the Angels Absolutely Considered." Concluding with a section detailing the role of Jesus and the Sacraments in the soul's salvation, it opens with a discussion of God's existence, including the author's famous "Five Proofs". Left incomplete when its author experienced a great change while saying mass in December 1273, it still provides a thorough survey of Scholastic thought and serves as the basis for the teachings of the Roman Catholic Church.  FTP, name this massive work by Thomas Aquinas.
Sections of this philosophical work include "Of Heresy," "Of the Priesthood of Christ," "The Immutability of God," and "Of the Substance of the Angels Absolutely Considered."
Summa Theologica or Summa totius theologiae