Passage Summary: It is wrong to use phrases like 'as the saying goes' if the example you just gave actually contradicts the quote you are about to say.

Reasoning: Phrases like 'as the saying goes' imply that the preceding statement illustrates the quote, making them inappropriate when used after a counterexample.

Analysis: This question asks us to identify a violation of a specific principle regarding linguistic usage. We are looking for a 'mismatch' where a speaker provides a specific instance and then introduces a proverb that the instance actually disproves. The key is to find an answer where the 'illustration' is actually a counterexample to the quote. If someone says 'I hate exercise' and follows it with 'as they say, health is wealth,' they have used the phrase inappropriately.