From Vulture
KC: You cant approach it as a silly line. It was Bruce Wayne talking to himself, reaffirming his own identity. It was like if Im about to go onstage and Im terrified and I think Ill never remember everything and I have a panic attack. Its Kevin Conroy saying, Goddamn it, Kevin. You are an actor. You are a good actor. You know this role. You can do this role better than anybody. Do it. That was what I was imagining the first time I did it. Hes saying it to himself rather than proclaiming it to the world. Hes psyching himself up. Hes going, [enters Batman voice] I am vengeance. I am the night. I am and then the Batman just screams out of him. If you do it like a histrionic speech then it sounds ridiculous. But if you do it from inside, like youre trying to convince yourself, youre trying to find the strength within you to do the act you have to do, then it just comes out from inside of you.