The Satan's sole task is to give you an increasingly hard time, so that you will be capable of earning greater and greater levels on your own. It is very easy for us to remain static in our level of observance. We need to put in avoda, labor in order to keep ourselves moving forward all the time. Because of the fact that our existence is contingent on G-d, we cannot do anything. Why is it that G-d can do things, and by mere will? Explore the dependance of mankind on G-d, and how we can keep ourselves constantly moving and growing.