Abstract
As for every other mediaeval author, also for St. Thomas the main source of his logic is Aristotle.1 This may be directly evidenced from the fact that the greatest part of the logical works written by the Scholastics, among them Aquinas, are commentaries to one or more of the six books of the Organon (The Categories, On Interpretation, Prior Analytics, Posterior Analytics, Topics, On sophistical Refutations).
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