| 19360 | General principles, even if unconscious, are indispensable for thinking [Leibniz] |
| 19404 | Necessities rest on contradiction, and contingencies on sufficient reason [Leibniz] |
| 7807 | The laws of thought are true, but they are not the axioms of logic [Bolzano, by George/Van Evra] |
| 6933 | The laws of reality are also the laws of thought [Feuerbach] |
| 8939 | We should not describe human laws of thought, but how to correctly track truth [Frege, by Fisher] |
| 5396 | Three Laws of Thought: identity, contradiction, and excluded middle [Russell] |
| 5405 | The law of contradiction is not a 'law of thought', but a belief about things [Russell] |
| 9131 | Two long understandable sentences can have an unintelligible conjunction [Sorensen] |
| 6560 | The law of noncontradiction is traditionally the most basic principle of rationality [Fogelin] |