What is the persuasive message of president mandela's speech? of what does he attempt to convince his audience?

One of the many persuasive messages of President Mandela's speech :
“I learned that courage was not the absence of fear, but the triumph over it . The brave man is not he who does not feel afraid, but he who conquers that fear.” He then continued  " if you’re afraid; it’s normal, you’re still a brave person. What you need to do next is to conquer that fear by taking action."  He attempt to convince people by his technique of persuasion.  By anticipating an audience’s questions, He confront the question in their mind. And he answer their question. This connects with people because it builds trust, people see that He understand their view, and makes new space in their mind for his message.