Mochi wa Mochiya (餅は餅屋 - The Expert Know Best)
No matter what the work is, the expert will always do a much better quality job than the amateurs.
To explain this fact, you can use the Japanese proverb, 'mochi wa mochiya' (餅は餅屋).
Since 'mochi' (餅) means "(traditional Japanese) rice cake," and 'mochiya' (餅屋) means "rice cake shop," the literal meaning of 'mochi wa mochiya' is "(good) rice cakes are (sold) in rice cake shops."
In other words, the most delicious rice cakes are made at rice cake shops.
In practice, this proverb is often used when asking experts to repair plumbing or home electronics.
「餅」は "(traditional Japanese) rice cake"、「餅屋」は "rice cake shop" を意味するので、「餅は餅屋」の文字どおりの意味は "(good) rice cakes are (sold) in rice cake shops" となります。
- No matter what the work is, the expert will always do a much better quality job than the amateurs.
- No matter what the work is, the expert will always do a much better quality job than amateurs.
I knew an American guy who always thought the opposite - that he knew more than the experts. He would visit a dentist and think he understood dentistry better than them. He would apply for a translating job, and think that the reason why he wasn't hired was because they didn't understand how to translate properly. He refused to take the standardized Japanese Language Proficiency Test because he thinks that the test is flawed and doesn't test normal Japanese ability. Despite recycling being an important part of Japanese culture, he thinks he understands recycling better than the average Japanese, but he doesn't. That guy drives me crazy. Mochi wa mochiya! (But not all the time.)