When I was running 12 miles a day, it often was a solitary event.  You would run off and let your mind wander.  A great time for dreaming up new ideas!  However, I always took someone along or joined a group when I wanted to speed up the run.  It never fails.  Share the experience with someone else and you gain from their strength.

The same goes with persuasion.  You want to build your message upon the experiences of your reader or listener.  Their viewpoint strengthens your message and you are able to encourage them to help you persuade them.

Third-party authority comes into play when you share an experience.  By turning time over to a partner or a friend to share your message, your persuasion gains authority through the share experience.  If you want to persuade, work on finding ways to share the experience with the person you are attempting to persuade.