Success is not a destination but a direction. If you look at all this "successful" people, most of them don't ever want to stop because they don't think they are there yet.
Results are after the finish line. After you think you've put down your best then you'll get back what you put in in the first place. Thats the only time one will ever see results. But the finish line is also where you choose to stop. If its hard then it is towards the right direction.
It is easy to do that one thing that you want, be it studying for an exam or waking up early for work or trying to catch up with any commitment, But it is easier to not do it as well.