2) fly out our mouth? Can you keep a secret? How about a promise? Does your language need some cleaning up? Do you always try to be honest? Do you use your words to purposely hurt people? Do you know when to not talk, and to listen instead?
If you realize that you are lacking in any of these areas, and you want to have a platform where you can have a great effect, speaking to large crowds...
then make a conscious effort to work on them.
The effort will be worth it.