“ A person without clear ideas is one who habitually classes together, under the same general names, things which have no common properties, or none which are not possessed also by other things; or who, if the usage of other people prevents him from actually misclassing things, is unable to state to himself the common properties in virtue of which he classes them rightly. ”
John Stuart Mill, A System Of Logic, Ratiocinative And Inductive (1843). copy citation
| Author | John Stuart Mill |
|---|---|
| Source | A System Of Logic, Ratiocinative And Inductive |
| Topic | virtue property |
| Date | 1843 |
| Language | English |
| Reference | |
| Note | |
| Weblink | http://www.gutenberg.org/files/27942/27942-h/27942-h.html |
Context
“The primary condition implied in having this clear idea, is that the class be really a class; that it correspond to a real distinction; that the things it includes really do agree with one another in certain particulars, and differ, in those same particulars, from all other things. A person without clear ideas is one who habitually classes together, under the same general names, things which have no common properties, or none which are not possessed also by other things; or who, if the usage of other people prevents him from actually misclassing things, is unable to state to himself the common properties in virtue of which he classes them rightly.
But is it not the sole requisite of classification that the classes should be real classes, framed by a legitimate mental process? Some modes of classing things are more valuable than others for human uses, whether of speculation or of practice;”
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