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Wer fremde Sprachen nicht kennt, weiß nichts von seiner eigenen.
Wer fremde Sprachen nicht kennt, weiß nichts von seiner eigenen.
This line suggests that learning another language is also a way of seeing one’s own more clearly. It leans toward an internal standard. Because it is brief, it can widen toward study, self-understanding, and the quiet deepening of perception through comparison.