When your life becomes the message, words become secondary.
Your words, although powerful and creative, are only meaningful to people if your experience matches what you have to say.
Listening to a teacher talk about World War 2 is rarely as engaging as listening to the emotions of a holocaust survivor. Hearing a lecture about biology is nowhere as captivating as interacting with a biologist.
Talking will only get you so far, because the most effective learning is not based on words, but experience. Only when someone has experience to validate their words are people willing to listen.
The reasons why personal stories are so great at engaging audiences is because it reveals experience. When someone has an idea and shares a story, the idea becomes credible if the story validates the idea. When a story validates an idea, the audience is given a real example of how the idea works, and has an easier time accepting the idea.
Words should never be the message, they should merely deliver the message. Effective words reveal the heart and character of the speaker. Teaching should come out of experience, not simply words. When your life becomes the message, your words simply deliver the message.