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τὸ κεφάλαιον

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)

τὸ κεφάλαιον = capital, in fine, the chief point, the chief points, the main features, the main point, the principal point, the crowning act

⇢ Look up "τὸ κεφάλαιον" on Google | LSJ full text search (Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)