Answer:
In order to be believed you must have your own beliefs to in life or your own philosophy on how you convinced a person. In order to do that you must tell them what is your principle in life and why your are doing the speech, tell them your purpose and why you are doing it. Just be confident in yourself in order to deliver the message properly. Be yourself, and they will see that your being true to your speech and that can made a person believed you.
Step-by-step explanation:
Hope it helps