A book is not a tweet. A book is not a half-hour television show. A book requires for both reader and writer sustained discipline attention. It asks you to immerse yourself in something and really deeply feel it.

In terms of optimism, I am optimistic. I do think that, in the long term, that America will right itself. I have to think so.

It is part of what makes America great. That tradition of the free press, and also the tradition of this highly competitive market for investigative journalism. We're seeing, there's no question, that we're seeing a renaissance of that.

It is really something, the extent to which we allow ourselves to live without thinking of things that we know, in the abstract, are bad, and are going on right now, somewhere far away. We think, "Well, what are you gonna do?" In a way, that little instinct, that "What are you gonna do?" is the most dangerous thing in the world.

There is no shortage of ways that people profit indirectly from the misery and cruelty in other places. Even now, the shirts we wear and the tomatoes we eat. There are unfortunately unfair and inhumane conditions - including literal slavery - all over the world.

That one lesson that African American communities have learned over the centuries in America is that you can't just take for granted that things will steadily get better and better and better until they're great. It is fits and starts. It is backward and forward.

I think it's a very stark marker of what kind of president we have that, from all available evidence, Donald Trump has not read a book, as an adult. This is not someone who sits down in the evening to consider the latest bestseller, let alone Tolstoy - but who is very very active on this medium that requires no discipline and no attention and no empathy. It is all about retweeting praise of oneself or very quickly or poorly considered, ill-typed, misspelled diatribes against other people.