When I was arrested opposing the war in Vietnam in 1965, as I said about 20 or 30% of people were opposed to the war. By 1968, more than half of Americans were opposed to the war. If you pull in Europeans, Canadians, people from around the Third World, the war was vastly unpopular. But even half of Americans by 1968 opposed the war.

Every politician - FDR, Lyndon Johnson, Abraham Lincoln, Barack Obama - they're all conservative by nature. They are part of the big thing and they're moving in a very constrained world.

[The whole first year at university] was a great time for me and great time of awakening.

Where's the activism? Nobody knows. And anyone who thinks they know, like Todd Gitlin, has their head up their ass. Nobody knows. The day before every revolution that's ever happened, that revolution was impossible. The day before Rosa Parks, that was impossible. The day after, it was inevitable.

All that means to me is that people who have a vision of a better world have a responsibility to open their eyes, to pay attention, to act on what the moment demands, and to be humble about that action.

Let's look at two things real quickly: the civil rights movement in Mississippi in the Sixties and the Arab Spring starting in Tunisia and Cairo. What they had in common was people who were told, and who believed inside themselves, that they were a certain way, and the society at large believed it.

I always say your body is the temple of your spirit, why not decorate it? My kids say, no, no, your body is the temple of your spirit, keep it clean. I'm covered in tattoos and I get a tattoo every time I write a book. I get the tattoo from the book.