Unlike the jar of peanut butter we can sometimes manage to scrape through the bottom of the jar and find a whole new supply of motivation. Very simply put, motivation breeds motivation. As we find the resolve to start, keep or redo a project, we may find that the motivation fills our life.
As motivation fills our life more projects become doable, things don't seem so hard. Sometime all we have to do is scrape the sides of the jar enough to get moving and we will find the jar full again.