Customers don't know what they want. There's plenty of good psychology research that shows that people are not able to accurately predict how they would behave in the future. So asking them, 'Would you buy my product if it had these three features?' or 'How would you react if we changed our product this way?' is a waste of time. They don't know.

Entrepreneurs can't forecast accurately, because they are trying something fundamentally new. So they will often be laughably behind plan - and on the brink of success.

Every startup has a chance to change the world, by bringing not just a new product, but an entirely new institution into existence.

Zero invites imagination, but small numbers invite questions about whether large numbers will ever materialize.

In a startup, both the problem and solution are unknown.

When blame inevitably arises, the most senior people in the room should repeat this mantra: if a mistake happens, shame on us for making it so easy to make that mistake.

The only way to win is to learn faster than anyone else.