testify
A witness can only testify to what he has seen and heard himself. Anything else is hearsay. A teacher can relate the lessons of history, but is most effective teaching from firsthand experience. You have seen this difference already in the instruction you have received. My audiences marveled at the way I taught, as one having authority, and not as the scribes. Now you are in a position to teach others. Since you have observed this more effective method, go forth and use it yourself. You have your own narrative of life in me. You have authority in me to let your mouth speak out of the fullness of your heart.