5 ideas
| 6558 | A foolish consistency is the hobgoblin of little minds [Emerson] |
| 1556 | By nature people are close to one another, but culture drives them apart [Hippias] |
| 17371 | Some kinds are very explanatory, but others less so, and some not at all [Devitt] |
| 17372 | The higher categories are not natural kinds, so the Linnaean hierarchy should be given up [Devitt] |
| 17373 | Species pluralism says there are several good accounts of what a species is [Devitt] |