Single Idea 1547

[catalogued under 13. Knowledge Criteria / E. Relativism / 1. Relativism]

Full Idea

He began one of his books as follows: 'Man is the measure of all things - of the things that are, that they are, and of the things that are not, that they are not'.

Gist of Idea

Man is the measure of all things - of things that are, and of things that are not

Source

Protagoras (fragments/reports [c.441 BCE], B01), quoted by Diogenes Laertius - Lives of Eminent Philosophers 09.51

Book Reference

'The First Philosophers', ed/tr. Waterfield,Robin [OUP 2000], p.211