People see you closely. They can feel your pulse. It's not easy to lie. It's not easy to put on an act. Your behavior and your actions is the example you set. People believe your example (behavior, actions), and not your words.
The same noble words can be uttered by thousands. The difference lies in the context, and the style. It depends on what circumstance you have uttered then in. Words hence become hollow. People are merely following the example you set. It is only by that that people will form an opinion of you. The best words you can utter is your example.
Change the world with your example, not your words.