Ben Horowitz
Culture is not like a mission statement; you can’t just set it up and have it last forever. There’s a saying in the military that if you see something below standard and do nothing, then you’ve set a new standard. This is also true of culture—if you see something off-culture and ignore it, you’ve created a new culture.
From Ben Horowitz: What You Do Is Who You Are - How to Create Your Business Culture.