The point here is that not everything that is urgent is necessarily important. We often make something out to be urgent when it doesn't have to be because of our obsessive quest for control. You know what I mean. We get stressed out about a lot of (small) things because we want them to be just the way we want, not because they have to be. "Your greatest danger is letting the urgent things crowd out the important" (Charles E. Hummel, "Tyranny of the Urgent").
There's nothing more important than choosing whom we will serve--God or Satan. A decision of this kind of magnitude carries with it a degree of urgency that surpasses all other choices in life. And this decision is most urgent because it will determine the trajectory of our life in a most significant way. It will affect every other decision we make for the rest of our life--what we will live for and how we will live each and every moment of our life. This choice is the most urgent choice because it is the foundation upon which we build the rest of our life and beyond.