言多必失

有些人喜歡對他的概念、產品、演說多說上幾句，以為如此可以多增添光彩。

然而，在某些情境下，閉上你的嘴巴更好：

1. 過度銷售。當客戶已經顯露出她即將決定購買時，最好不要對你的產品再加油添醋吹捧。這樣很可能會激起客戶想起讓她拒絕購買的理由。
2. 降低自己的權威。不要在準備開會、或是預備演講時、甚至預備提交報告時，說你還沒有準備好。這樣會讓你的聽眾或是讀者感到不受尊重，並且看低了你的權威。
3. 對很鮮明的主張進行挑戰。當人們多半已經相信了某種主張時，不要輕易嘗試挑戰其基本假設或基本立場。如果你說“這輛車不會故障”，反而會引發人們懷疑這車子何時會故障。

He that talks much errs much

Some people like to say a few more words about his concept, products and speeches, thinking that it can add more luster.

However, in some situations, it's better to close your mouth:

1. Oversale. When a customer has revealed that she is about to make a purchase, it's better not to flatter your product. This will probably arouse customers to think about the reasons why she refused to buy.
2. Reduce your authority. Don't say you're not ready when you're preparing for a meeting, a speech, or even a report. This will make your audience or reader feel disrespected and belittle your authority.
3. Challenge very clear ideas. When people have mostly believed in an idea, don't easily try to challenge its basic assumptions or positions. If you say "this car won't break down", it will cause people to wonder when it will break down.