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Summa Theologiae · I, q. 87

Question 87. How the Intellectual Soul Knows Itself and All Within Itself

Thomas Aquinas, Summa Theologiae, First Part. 4 articles.

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Text: Summa Theologiae, Project Gutenberg #17611, First Part (Prima Pars), translated by the Fathers of the English Dominican Province. The First 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 have now to consider how the intellectual soul knows itself and all within itself. Under this head there are four points of inquiry:

(1) Whether the soul knows itself by its own essence?

(2) Whether it knows its own habits?

(3) How does the intellect know its own act?

(4) How does it know the act of the will?

Articles

  1. Whether the Intellectual Soul Knows Itself by Its Essence?
  2. Whether Our Intellect Knows the Habits of the Soul by Their Essence?
  3. Whether Our Intellect Knows Its Own Act?
  4. Whether the Intellect Understands the Act of the Will?

Also online, linked only: the same translation at New Advent and the Latin text at Corpus Thomisticum. Neither is copied here.

Source: Thomas Aquinas. Summa Theologica, First Part. Project Gutenberg #17611. Project Gutenberg record. Public domain in the USA. Outside the U.S., check local copyright rules. Project Gutenberg notices retained. The full Project Gutenberg license is kept in the hosted text.