Full Idea
If speaking is doing and making then nobody speaks things that are not, since he would then be making something, and no one is capable of making something that is not. So according to your own statement, nobody tells lies.
Gist of Idea
If speech is making something, then lies are impossible
Source
Plato (Euthydemus [c.385 BCE], 284c)
Book Reference
Plato: 'Complete Works', ed/tr. Cooper,John M. [Hackett 1997], p.721
A Reaction
This problem pops up again in the twentieth century, with the quest for logical form. How can a lie be meaningful if it doesn't refer to anything?