Full Idea
The person who speaks what is and the things that are speaks the truth.
Gist of Idea
Truth is speaking what is and things that are
Source
Plato (Euthydemus [c.385 BCE], 284a)
Book Reference
Plato: 'Complete Works', ed/tr. Cooper,John M. [Hackett 1997], p.721
A Reaction
We now use 'facts' for what is, and 'real' or 'actual' things for what are. I'm perfectly happy with that conception of truth. Demanding something more precise called 'correspondence' looks hopeless. You have to believe there are facts.