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Full Idea
If two individuals were perfectly similar and equal and, in short, indistinguishable in themselves, there would be no principle of individuation.
Gist of Idea
If two individuals could be indistinguishable, there could be no principle of individuation
Source
Gottfried Leibniz (New Essays on Human Understanding [1704], 2.27)
Book Ref
Leibniz,Gottfried: 'New Essays on Human Understanding', ed/tr. Remnant/Bennett [CUP 1996], p.230
A Reaction
This seems to be the main motive for Leibniz's unusual claim that there cannot be two indiscernible individuals, but it looks suspiciously like an a priori claim made about what should be an a posteriori discovery. Are electrons distinguishable?
| 14524 | Bodies are combinations of shape, size, resistance and weight [Epicurus] |
| 12971 | If two individuals could be indistinguishable, there could be no principle of individuation [Leibniz] |
| 19379 | The law of the series, which determines future states of a substance, is what individuates it [Leibniz] |
| 10194 | Two things can only be distinguished by a distinct property or a distinct relation [Black] |
| 17668 | It is likely that particulars can be individuated by unique conjunctions of properties [Armstrong] |
| 8520 | An individual is a union of a group of qualities and a position [Quinton, by Campbell,K] |
| 17647 | Kripke individuates objects by essential modal properties (and presupposes essentialism) [Kripke, by Putnam] |
| 15455 | Total intrinsic properties give us what a thing is [Lewis] |
| 8303 | Criteria of identity cannot individuate objects, because they are shared among different types [Lowe] |
| 16680 | Scholastics thought Quantity could be the principle of individuation [Pasnau] |
| 16785 | If you reject essences, questions of individuation become extremely difficult [Pasnau] |