Summa Theologica of St. Thomas Aquinas, 5 Vols.

Constructed idea upon idea like a magnificent gothic cathedral, Aquinas's attempt to summarize all that was knowable about God and his relations with man offers a brilliant synthesis of medieval Christian thought. Consisting of 38 tracts, 631 questions, nearly 3,000 articles, and 10,000 objections with answers, it represents the full flowering of scholastic theology. 3020 pages total, five hardcovers from Ave Maria.