Keep your thoughts and words to yourself. Words can hurt, have others perceive you as a simpleton, or turn against you because they disagree with what you are saying. Keep most of your words to a simple yes, no, please, and thank you.
When you have to speak arrange your flow of words to soothe bitterness, or hostility, to cover perceived weaknesses and to inflate the power of your position during negotiations.
What you have to do is convince others that your thoughts are good enough that they will try to sell your idea to others. This makes you look like a leader and allows you to influence the direction others take or the actions they perform.
You will always need others to help you reach the level of success you are capable of achieving.