One thing that founders forget is that after they hire employees, they have to retain them.

You only get points when you make something the market wants. So if you work really hard on the wrong things, no one will care.

I prefer to invest in a company that's going after a small but rapidly growing market than a big but slow growing one.

... you want to be proud of how much you can get done with a small numbers of employees.

In YC experience, 2 or 3 co-founders seems to be about perfect.

It's difficult to get large groups of people, to the extreme levels of focus and productivity that you need, for a startup to be successful.

A single mediocre hire in the first five will often in fact kill a startup.