We are often too late with our brilliance. We are on time delay. The only instant gratification comes in the form of potato chips. The rest will find us by surprise somewhere down the road maybe as we sleep and dream of other things.

Surviving the grind of 18-hour days and getting up at four in the morning to work out for an hour so I'd have the energy to do it again the next day. I did not know I had that discipline. I did not know I had the discipline to learn a seven-page scene in three hours to shoot that day or the next day. I didn't know that I was capable of realizing that potential.

I remember the day Richard Nixon won in 1968. That was a time that seemed certain to bring about long awaited seismic change in America. But events of tragic proportion took us on a turn. Bobby Kennedy and Martin Luther King, Jr. were suddenly dead.

I turned down a lot of things - some very lucrative - because I could afford to at that time. That didn't lead to a happy place. I was happy to spend time with my family, get to know my daughter, who was born during The West Wing.

There's a genetic memory that stays on your bones. What you experience when you're young, I think it stays with you.

I had been used to improvising and even in the audition I was feeling free to rearrange Aaron Sorkin words a little bit, as lovely as they were. I didn't find out until after I got the part how furious Aaron was at me for doing that. They said, "He was livid. He did everything in his power not to jump down your throat!" But I came to realise that Aaron was writing in metre and the rhythm of the language is very important.

I didn't expect NBC would be at all thrilled about me, because the year before the West Wing I had rejected a pilot at the last minute and got them very upset. I ended up not coming to the casting - in fact it happened four different times because I just wasn't convinced that I wanted to do television.