Identify one type of rhetorical devices used in paragraph and what sentence is it?

But you young people must do one thing, and I know you have heard this story a thousand times from your mothers and fathers, like I did from my mama. I didn’t take her advice. But I accomplished the same in another fashion. You must get an education. You must go to school, and you must learn to protect yourself. And you must learn to protect yourself with the pen, and not the gun. Then you can answer them, and I can tell you—and I don’t want to sound corny—but friends, the pen really is mightier than the sword.