I think people are screw-ups, and even our greatest heroes are deeply flawed human beings. People make bad decisions for all the wrong reasons, and then somehow they'll do the right thing, and then somehow they'll save somebody, or they'll be compassionate. Horrible people can do wonderful things, and wonderful people can do horrible things.

After you get a season under your belt, you learn a lot of lessons. It's a much bigger challenge, logistically, in terms of production.

When Kirk dies it was very emotional and very strange, in the moment and all the way through the process. I'd read it in the script and I'd always be struck by what I'd just done and what we were doing, and that this was my childhood hero and I was writing his death.

Now I know that if I'm in a fight or a big argument with executives or the studio or whoever, and it's getting to a point where it's starting to get bad, I don't have to have the fear of, "Am I strong enough to see this through? Would I really make a stand here? Would I really quit over this issue?" And I know in my heart that there is a place where I would walk away. I don't have to make it about my ego. I don't have to make it about whether I'm being strong enough or tough enough.

There are definitely times when the outside eye can shine a light on something you weren't aware of. They're usually exposing a flaw or a problem. Sometimes they're saying, "Hey, this doesn't really work. Have you seen this?" And then, you go, "Oh, I didn't really see that. You're right, that doesn't work." If they're good, they shine a light on issues that you're blind to because you're too close to it.

The creative part, with the writing of it and the vision, and finding the voice of a show and the characters, is much harder to teach somebody. It's like music. You can either play it or you can't. If you can't play music and you really struggle and work hard, you can learn, but you have to have some inner gift to take it to the next level.

As frustrating as it gets, at times, and as frustrating as it is, at times, I don't think I've ever considered doing something else, or not wanted to do it anymore. To me, it's just the greatest job. It's a good fit for who I am and what I want to be.