... for the top twenty most valuable YC companies, all of them have at least two founders.

Why now, why is this the perfect time for this particular idea, and to start this particular company?

If you have several ideas that all seem pretty good, work on the one that you think about, when you're not trying to think about work.

The way to have a company that executes well is you have to execute well yourself.

You think you have this great idea that everyone's going to come join, but that's not how it works.

You have to be decisive. Indecisiveness is a startup killer.

I really believe that the single hardest thing in business is building a company that does repeatable innovation... and just has this ongoing culture of excellence as it grows.