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| 19360 | General principles, even if unconscious, are indispensable for thinking [Leibniz] |
| Full Idea: General principles enter into our thoughts, serving as their inner core and their mortar. Even if we give no thought to them, they are necessary for thought, as muscles and tendons are for walking. | |
| From: Gottfried Leibniz (New Essays on Human Understanding [1704], 1.01.20) | |
| A reaction: Famously, Leibniz identified sufficient reason and non-contradiction as the two foundational principles. Modern logicians seem less keen on this idea, but then they have less interest in how we actually think. |