My favorite version is similar. Each day he tries to push the boulder a little higher, and as the boulder starts to slide back, he mentally notes his improvement before racing the boulder down to the bottom with a smile on his face.
Because he gets a little stronger and a little more skilled every day, and he knows that one day he'll succeed.
In the M. Night version: his improvements are an asymptote - and Sisyphus didn't pay enough attention in calculus class to realize that the limit is just below the peak.
Here's the new thread for posting quotes, with the usual rules: