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ἐσθλόν

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.

Russian (Dvoretsky)

ἐσθλόν: τό счастье, преуспеяние: παρὰ καὶ κακῷ ἐ. τιθέναι Hom. вместе с горем даровать и счастье.