Full Idea
If Euthydemus is wrong that everything always has every attribute simultaneously, or that being or essence is private for each person, then it is clear that things have some fixed being or essence of their own.
Gist of Idea
Things don't have every attribute, and essence isn't private, so each thing has an essence
Source
Plato (Cratylus [c.375 BCE], 386d)
Book Reference
Plato: 'Complete Works', ed/tr. Cooper,John M. [Hackett 1997], p.104
A Reaction
I'm not sure what 'being or essence' translates. If it translates 'ousia' then I wouldn't make too much of this remark from an essentialist point of view.