ὁ μὴ πεπλευκὼς οὐδὲν ἑόρακεν κακόν → anyone who hasn't sailed has never seen trouble
gén. de οὗτος.
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.
