Available in PDF, epub, and Kindle ebook. This book has 1,356 pages in the PDF version, and was originally published 1265–1274; this translation was published in 1947 (copyright wasn't renewed).
This is Part 1 of the Summa Theologica, one of the classics of the history of philosophy and one of the most influential works of Western literature. It is perhaps most famous for its five arguments for the existence of God (known as the 'five ways'). It was written to explain the Christian faith to theology students.
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Thomas à Kempis