Ben Horowitz on Culture
Ben Horowitz is the author of What You Do Is Who You Are. I really liked this paragraph on culture.
Your culture is how your company makes decisions when you're not there. It's the set of assumptions your employees use to resolve the problems they face every day. It's how they behave when no one is looking. If you don't methodically set your culture, then two-thirds of it will end up being accidental, and the rest will be a mistake.