What do you mean, words are power?

In social, diplomatic and political systems, mastering the right to speak means mastering the leading power.

Because the right to speak makes you qualified to put forward the basic ideas to deal with problems, and gives you the opportunity to convince and even incite the people. You can use your right to speak to guide public opinion, create prejudice among the people and win their support and trust. This has nothing to do with democracy, because in most democratic systems, people only have the right to choose and have no right to speak.