Firing people is one of the worst parts of running a company. Actually in my own experience, I think it is the worst.

Cofounder relationships are among the most important in the entire company.

One of the biggest advantages that start ups have is execution speed and you have to have this relentless operating rhythm.

Remember that you are more likely to die because you execute badly than get crushed by a competitor.

You have to be intense. This only comes from the CEO, this only comes from the founders.

I think as a rough estimate, you should aim to give about 10% of the company to the first 10 employees.

I care much more about the growth rate of the market than it's current size and I also care if there's any reason it's going to top out.