Full Idea
He used legislation to improve the condition of illiterate people, on the grounds that they lack one of life's great goods, and thought literacy should be a matter of public concern and expense.
Gist of Idea
He spent public money on education, as it benefits the individual and the state
Source
report of Protagoras (fragments/reports [c.441 BCE]) by Diodorus of Sicily - Universal History 12.13.3.3
Book Reference
'The First Philosophers', ed/tr. Waterfield,Robin [OUP 2000], p.219