We have important things to talk to the Russians about, despite their meddling in our elections. I hope they're talking about a way to eventually end this horrific humanitarian crisis in Syria, end that war. The Russians have more leverage than we do. I hope they're talking about the fact that, if Kim Jong-un's long-range missiles can reach Alaska one day, they can also reach Vladivostok.

When somebody underestimated me, it made me want to prove them wrong.

When you have big historic changes, there are going to be ups and downs... There are going to be peaks and valleys. Some things are going to go right. Some things are going to go wrong. But as long as the strategic direction is going in the right way, that's really what you have to judge.

I feel that we're dividing along class lines for the first time in our history. Now one thing that has happened in this reaction to globalization is that the elites are not respectful of the values of those who are ordinary citizens, so we seem to be dividing ourselves into ever-smaller identity groups, each with its own narrative, each with its own grievance, and that's a problem.

Self esteem comes from achievements. Not from lax standards and false praise.

I firmly believe you never should spend your time being the former anything.

I'm very glad my mother didn't let me quit piano lessons at age 10. She said I wasn't old enough or good enough to make that decision, and she was right. I remember at the time I was shocked. I did not like that my mother said those things to me. But when I got a chance to play with Yo-Yo Ma or more recently with Aretha Franklin, I thought, I'm really glad she said what she did.