You want to be greedy when others are fearful. You want to be fearful when others are greedy. It's that simple. … They're pretty fearful. In fact, in my adult lifetime, I don't think I've ever seen people as fearful economically as they are right now.
Interview with Charlie Rose, on PBS (1 October 2008), also reported in "Warren Buffett: I Haven't Seen As Much Economic Fear In My Adult Lifetime - Charlie Rose Interview" at CNBC (1 October 2008)