Some would say that we are motivated by need.  I don’t agree.  I’ll never lose the twenty pounds I need to lose just because I need to.  I’ll not eliminate a bad habit because of need.  I won’t even discipline myself in the area of spending if it is based only on need.  I’m just like you.  I generally do what I want to do.  Self-discipline is about getting my “want to” lined up with my “need to.”