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The Medieval Church · c. 1259–1265
Summa Against the Gentiles
Thomas Aquinas · 1225–1274
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What it is
Four books arguing the faith without appeal to scriptural authority for the first three, on the grounds that with Muslims and Jews one cannot begin from a shared text.
Why it lasted
The most sustained attempt in Christian history to argue theology on purely rational ground, and Aquinas's most readable major work.
Where to read it
Public domain and free to read in full, though not held here. The archives below have it.
These open a search on each archive rather than a direct link, which is the honest way to point at an edition nobody here has checked line by line.
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