Sex and gender are qualities which belong to substances, but cannot belong to the qualities of substances.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

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Author Adam Smith
Source The Theory of Moral Sentiments
Topic gender sex
Date 1759
Language English
Reference
Note
Weblink https://en.wikisource.org/wiki/The_Theory_of_Moral_Sentiments

Context

“When we say, a great man, a great woman, the word great has precisely the same meaning in both cases, and the difference of the sex in the subjects to which it may be applied, makes no sort of difference in its signification. Magnus, magna, magnum, in the same manner, are words which express precisely the same quality, and the change of the termination is accompanied with no sort of variation in the meaning. Sex and gender are qualities which belong to substances, but cannot belong to the qualities of substances. In general, no quality, when considered in concrete, or as qualifying some particular subject, can itself be conceived as the subject of any other quality; though when considered in abstract it may.” source