When you try to do something ten per cent better, you tend to work from where you are: if I ask you to make a car that goes 50 miles a gallon, you can just retool the engine you already have.

If you don't have a tonne of optimism, you're not going to make it... you won't be able to evangelise to everyone else. On the other hand, if you aren't constantly paranoid about what can go wrong and put plans in place, then you're going to get bitten at some point.

Really great entrepreneurs have this very special mix of unstoppable optimism and scathing paranoia.

Astro Teller Quotes