I find it motivating that the worlds best salesperson had a stutter

I find it motivating that the worlds best salesperson had a stutter So I just finished reading a book by Joe Girard named "how to sell anything to anyone", who was crowned as the [worlds best salesman](http://www.guinnessworldrecords.com/world-records/449506-most-cars-sold-by-a-salesman-in-a-year) by Guinness Book of World Records, where he sold 1.425 cars in a single year. In his book, he talks about how we suffered from a stutter up until he was 35 years old. The thing that caught me the most in his book was how he "overcame" stuttering. Although he has managed to speak almost fluently, he is not 100% fluent, which can be seen in [this](https://youtu.be/c0jdLhRCJRA?t=202) interview. His method for overcoming stuttering was to my surprise really simple. He basically says that you have to **Slow Down and think before you talk**. What do you think of his advice? I'm currently trying this out, but it is definitely harder than it seems. There must be some truth to this advice since this man went on to become the worlds best salesperson, don't you think?