History of European Morals from Augustus to Charlemagne, Third edition, revised (New York: D. Appleton, 1921). 2 vols. https://oll.libertyfund.org/titles/1840,
As Lecky stated, this work is an attempt to use the historical method to uderstand the merits of certain theological opionions from the beginning of the Roman Empire to the Middle Ages.
The text is in the public domain.
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