Whether as mantras or simply spurs to get out the door, runners love motivational quotes. Even elites like American marathon record-holder Deena Kastor read and display motivational quotes to get inspired, find new meaning in their running, and/or remind themselves during tough times that running always gives back what you put into it. We might not all be able to articulate the joys and challenges of running, but we can all recognize when someone has captured part of what it means and what…