General ideas can introduced into the mind only with the aid of words.
Gist of Idea
Only words can introduce general ideas into the mind
Jean-Jacques Rousseau (Discourse on the Origin of Inequality , Part I)
Hm. How did humanity manage to invent general words. Do animals not have general thoughts, e.g. about food, shelter, predators? Roussea goes on to deny that monkeys see nuts as a 'type' of fruit.
Rousseau,Jean-Jacques: 'The Basic Political Writings', ed/tr. Cress,Donald A. [Hackett 1987], p.50