All the Proof

[last lines]

Kelly Severide: [about his father, Benny, who recently died of a stroke] The last thing I said to him... was that you were a better father to me than he ever was. And then... then he does nothing. I ask him for one thing, despite every alarm bell in my head telling me not to... it's the same ol' Benny. He never...

Wallace Boden: You don't know.

Kelly Severide: I don't know what?

Wallace Boden: Your father stepped in, Kelly. He stepped up with Grissom. I've just spoken with the Commissioner. He met with him personally, talked about the situation in 51. About how it not only affected me, but the whole house, how it affected you. Every bit of goodwill, every piece of political capital, every favor he was ever owed, he put it on the line to appeal to the Commissioner to back off of 51 and it worked. Gorsch is gone. Your father told Grissom that I am the type of leader who molds good men into great ones, and that you Kelly... You're all the proof he needs to know that that's true. Those were the exact words of your father.