Someone once explained the subtle difference between motivation and discipline in the following way. Motivation is doing what you need to do, when you need to do it, because you want to do it. Discipline is doing what you need to do, when you need to do it, even when you don’t want to do it.
This came to mind tonight as I prepared for this post. Most of the time I am very motivated to write. Today, however, I was not able to write earlier in the day, and now I am tired and do not feel like writing. So tonight I am writing because, although I may not be motivated to do so, I am disciplined. And ironically enough, this anecdote was enough to fulfill my agreement with myself to post daily.