Summa Theologiae · I-II, q. 64
Question 64. Of the Mean of Virtue
Thomas Aquinas, Summa Theologiae, First Part of the Second Part. 4 articles.
Text: Summa Theologiae, Project Gutenberg #17897, First Part of the Second Part (Prima Secundae), translated by the Fathers of the English Dominican Province. The First Part of the Second Part of the Summa in the English Dominican translation (first printed 1911 to 1925; second and revised edition from 1920). A sample check on 2026-11-09 against pre-1931 printings at the Internet Archive (first printings of 1915 and 1916 and the second and revised edition of the 1920s) found that the article text matches, with no 1947 introduction, synopsis, or index. The phrase “From the Complete American Edition” in Gutenberg's catalog title is a provenance note only. Question and article numbers were added by the transcriber. Rights: Public domain (US)
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We must now consider the properties of virtues: and (1) the mean of virtue, (2) the connection between virtues, (3) equality of virtues, (4) the duration of virtues. Under the first head there are four points of inquiry:
(1) Whether moral virtue observes the mean?
(2) Whether the mean of moral virtue is the real mean or the rational mean?
(3) Whether the intellectual virtues observe the mean?
(4) Whether the theological virtues do?
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