I've been thinking a lot today about other areas in life for which the above fable's moral holds true: Little by little does the trick.
If we're doing a tough school assignment, we sometimes need to break it into smaller pieces. When we feel like giving up we often agree just to keep moving, even if it's a little bit. What often happens is that the satisfaction of getting that part done gives us just a litte encouragement to keep going even farther.
I also find myself using the motto when I'm cleaning or exercising. Just a little bit more before taking a break and the break feels all that much sweeter. It's incredibly satisfying to prove to myself that I really could accomplish more than I thought I had the energy to do.
For the record, I'm also a big fan of taking breaks and giving myself (and others) a little reward, which is why I often cozy up with my internet and a cup of coffee in the afternoons after school or other work is accomplished.