A Mother and Father brought their son to a retired and much-respected teacher who tutored students in speech and debate. The tutor interviewed the boy and found him to be an incorrigible chatterbox. She said she would tutor the young boy but would charge twice the amount she normally charged.
"But why?" asked the parents. "He already speaks very well."
"Because," replied the teacher,
"I must teach him two things instead of one - First, how to hold his tongue, and then how to use it."