display all the ideas for this combination of texts
2 ideas
| 12259 | Reasoning is when some results follow necessarily from certain claims [Aristotle] |
| Full Idea: Reasoning [sullogismos] is a discussion in which, certain things having been laid down, something other than these things necessarily results through them. | |
| From: Aristotle (Topics [c.331 BCE], 100a25) | |
| 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? |
| 17183 | Things are impossible if they imply contradiction, or their production lacks an external cause [Spinoza] |
| Full Idea: A thing is said to be impossible either because the essence of the thing itself or its definition involves a contradiction, or because no external cause exists determinate to the production of such a thing. | |
| From: Baruch de Spinoza (The Ethics [1675], I Pr 33) | |
| A reaction: Is the contradiction in nature or in logic? How can he be sure that there doesn't exist some causeless thing? |