I do think Tim Cook is doing a very good job, I think he has almost impossibly big shoes to fill with Steve Jobs' departure. And so, that's the context always someone has to put things in. But, I do think that for the most part that Apple is at a point where it's much more focused on scale than on doing new things.

As an investor-entrepreneur, I’ve always tried to be contrarian, to go against the crowd, to identify opportunities in places where people are not looking.

Twitter is hard to evaluate. They have a lot of potential. It's a horribly mismanaged company — probably a lot of pot-smoking going on there. But it's such a solid franchise it may even work with all that.

Beginning with brand rather than substance is dangerous.

Long-term planning is often undervalued by our indefinite short-term world.

We need more pessimism that the future might be a lot worse, and we need more optimism that the future might be better.

Competition is overrated. In practice it is quite destructive and should be avoided wherever possible. Much better than fighting for scraps in existing markets is to create and own new ones.