τίς κοινωνία
Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.Greek > English (Woodhouse Phrases Reversed)
τίς κοινωνία = what is the connection between, what is there in common between
⇢ Look up "τίς κοινωνία" on Google | LSJ full text search
(Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)