What is double tuition?

A young man asked the great philosopher Socrates for advice on oratory. He said a lot to show his eloquence.

In the end, Socrates asked him to pay double tuition.

The young man asked in surprise, "Why should I double it?"

Socrates said, "Because I have to teach you two courses, one is how to shut up and the other is how to make a speech."

The story of Spark of Wisdom seems to be a joke, but in fact it tells us that a successful speaker should be relaxed. What should be said is said, what should not be said is not said, and it is just right to stop.