Accept diversity and don't take any crap.

I don't want to make more friends. I have four kids, I have plenty of friends, and all the personal relationships I need.

My books are always tactical, bullet lists, this is what you need to do because I'm trying to appeal to people who are trying to change the world and they need checklists.

For startups, SM is now crucial: it has never been cheaper and easier to reach one's customers. Entrepreneurs should thank God for Twitter, Facebook.

For me writing is as close to being an engineer as possible.

Take my word for it: More people will like you if you believe that people are good until proven bad.

Companies in Europe should stop trying to do the U.S. version of a European idea.