"Focus is the art of knowing what to ignore."

"models...in times of crisis, the firm will pull back [risk] when they’re not sure, when they’re worried, and that’s part of that humility...they don’t have this arrogance...they get scared like you and I...in those kind of times [panic], [Simons] overruled his colleagues and he said, ‘Yes, we’ll probably make money here if we stick with our models, but I’m worried about surviving’