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The Medieval Church · c. 1160–1170
Summa on the Decretum
Stephen of Tournai · 1128–1203
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What it is
A lucid commentary on Gratian written for French students, later followed by a bitter letter complaining that theology students now argue about the Trinity in the street.
Why it lasted
A leading early commentary, and its author's complaint is the classic conservative reaction to the new university culture.
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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