Good dialogue.  

#1.   From raging bull.
I dunno maybe I don’t deserve to win, I done alot of bad things you know.  

Now Why is it good?  When we read this it shows self doubt and perhaps some guilt.
The character is not saying it out loud obviously but we can just tell by reading this dialogue In his subtext.  

Read the first few pages of this script study the dialogue good dialogue can also reveal a characters personality.   We can tell by reading this dialogue that the main character is arrogant.  
#2.   https://assets.scriptslug.com/live/pdf/scripts/dallas-buyers-club-2013.pdf