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τούτου

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.

French (Bailly abrégé)

gén. de οὗτος.

English (Strong)

genitive case singular masculine or neuter of οὗτος; of (from or concerning) this (person or thing): here(-by), him, it, + such manner of, that, thence(-forth), thereabout, this, thus.