Full Idea
In syllogistic arguments, granted one absurdity, others must follow too.
Gist of Idea
If a syllogism admits one absurdity, others must follow
Source
Thomas Aquinas (Summa Theologicae [1265], I-II Q19 6)
Book Reference
Aquinas,Thomas: 'On Law, Morality and Politics', ed/tr. Baumgarth,W. /Regan R. [Hackett 1988], p.9
A Reaction
This asserts the necessity of logical consequence, which he derives from Aristotle.