Full Idea
Reasoning [sullogismos] is a discussion in which, certain things having been laid down, something other than these things necessarily results through them.
Gist of Idea
Reasoning is when some results follow necessarily from certain claims
Source
Aristotle (Topics [c.331 BCE], 100a25)
Book Reference
Aristotle: 'Posterior Analytics and Topica', ed/tr. Tredennick,H/Forster,ES [Harvard 1960], p.273
A Reaction
This is cited as the standard statement of the nature of logical necessity. One might challenge either the very word 'necessary', or the exact sense of the word employed here. Is it, in fact, metaphysical, or merely analytic?