“An expert is a man who has made all the mistakes which can be made in a very narrow field.”
“An expert is a person who has made all the mistakes that can be made in a very narrow field.”
“An expert is someone who knows some of the worst mistakes that can be made in his subject, and how to avoid them.”
“Anyone who has never made a mistake has never tried anything new.”
“The following is a list of statements made many years ago by experts in their fields. At the time they were said they sounded intelligent. With the passing of time, they sound idiotic.”
“Show me a person who has never made a mistake and I'll show you someone who has never achieved much.”