We need physical exercise to prepare our brain for long periods of concentration

I have met many entrepreneurs who have the passion and even the work ethic to succeed - but who are so obsessed with an idea that they don't see its obvious flaws. Think about that. If you can't even acknowledge your failures, how can you cut the rope and move on?

I have great people working for me now. I surround myself with smart people.

I'm not a tough guy. I'm just delivering the truth and only the truth and if you can't deal with it, too bad.

There's only one side with me. You get the right side. You get the correct version of the facts.

I actually think being an entrepreneur is a state of mind. If you're going to be an entrepreneur, my thesis is that you have to sacrifice everything for some period in your life to be successful. You have to be myopic and completely focused and unbalanced in every way. Once you've achieved success, you're free to do whatever you like.

So much of life is a negotiation - so even if you're not in business, you have opportunities to practice all around you.