So let's make this a little bit clearer by diagramming right over here. You show up and you say, well, I want f of x to be within epsilon of our limit. So this right over here, this point right over here is our limit plus epsilon. And this right over here might be our limit minus. This right over here is the limit minus epsilon. And you say, OK, sure. I think I can get your f of x within this range of our limit.