Hey! I'm not sure if the principles of speech are universally recognized, but these 7 are mentioned in a popular article by amanet.org:
- Perception
- Perfection
- Visualization
- Discipline
- Description
- Inspiration
- Anticipation
If this isn't what you're talking about, I apologize; hopefully my answer can still help you:
- Perception - Think of this as your ego (its abundance or its lack); a big trait in public speaking/speech delivery in general is focusing solely on the topic of the speech. When you start worrying about the effectiveness of your delivery, that worry is recognizable and makes you less authentic. 
- Perfection - "Perfection" is kinda the same thing, with emphasis on not over-thinking the small mistakes you might make. 
- Visualization - If your audience can't visualize the ideas you're presenting, they'll quickly lose interest/get lost.  
- Discipline - Practicing/experience (obviously) makes you a better, calmer presenter. 
- Description - Methods like "painting pictures" in your audience's heads/using rhetorical appeals to build a solid foundation for your claims is super important.  
- Inspiration - Speak to inspire, not to aimlessly stuff your audience with weak, boring, cliche ideas. 
- Anticipation - Try to withhold key ideas for a little bit/linger on other information to create the feeling of suspense; when you create long-lasting interest, you become a more memorable speaker. 
Hopefully I was of some help! 
 
        
             
        
        
        
Answer:
I usually go with the last option, as it leaves the readers with an idea that changes need to happen in the world, and that they are the ones who can take part in it
Explanation:
 
        
             
        
        
        
1. "Atticus had used every tool available to free men to save Tom Robinson, but in the secret courts of men's hearts Atticus had no case. Tom was a dead man the minute Mayella Ewell opened her mouth and screamed." - Chapter 25
Scout figures out that sometimes bigotry and emotion overpower a supposedly objective justice system.
2. "Atticus was right. One time he said you never really know a man until you stand in his shoes and walk around in them. Just standing on the Radley porch was enough." - Chapter 31
Because of her age and limited knowledge, Scout takes her father's comment literally, musing that she can see the post office on the corner from the Radley porch. But the figural meaning is clear to readers.
3. "I said I would like it very much, which was a lie, but one must lie under certain circumstances and at all times when one can't do anything about them." - Chapter 13
Scout realizes it does no good to point out hurtful truths that cannot be changed.
Sample thesis statements: In the novel To Kill a Mockingbird, Harper Lee characterizes Atticus as a man who stands for justice above all else. In the novel To Kill a Mockingbird, Atticus Finch represents courage in almost every aspect of his life.
        
             
        
        
        
Answer:
They have Roman origin, they all have a specific meaning which is closely connected to their character, ex: Octavia is the feminine of Octavius, the family name of the man who became Octavian and then Augustus, first ’emperor’ of Rome.