Marie Lu said this quote

I have earned my revenge on everyone who hurt me. My father, who tortured me every day - I crushed his chest and his heart. Teren, sick and twisted and mad - I took away his beloved just as he took away mine. Raffaele, who betrayed and manipulated me - I seized control of the prince he loves, and I made sure he watched his prince destroy in my name. And Violetta, darling, dearest sister who turned her back when I needed her the most. I cast her out. I finally said everything to her that I wanted to say. I have hurt back.