One thing that founders always underestimate is how hard it is to recruit.

If someone is difficult to talk to, if someone cannot communicate clearly, it's a real problem in terms of their likelihood to work out.

It's better to have a few users love your product than for a lot of users to sort of like it.

You want an idea that turns into a monopoly. But you can't get a monopoly, in a big market right away; too much competition for that.

Stay focused and don't try to do too many things at once. Care about execution quality.

If you ever take your foot off the gas pedal, things will spiral out of control, snowball downwards.

You never want to be in a place where an employee has vested 3 out of the 4 years of stock and they start thinking about leaving.