Why difficult to discipline oneself?

Disciplining oneself is certainly the hardest thing to do. We are always doing things that we are not supposed to do or should not do. And we don't feel like doing things that ought to be done. I like the Steven Covey's concept of categorizing our tasks into urgent or/and important and work accordingly. I was discussing the same thing with my friend and he mocked 'with the time in categorizing your tasks, you would be able to complete all your tasks.' That was funny.



The point is I have been really lazy. With my lots of tasks piling up, I am confused with what about of time to give to those and end up with doing other things besides the thing I should be doing.