There's a story about when President Lyndon Johnson visited NASA and as he was walking the halls he came across a janitor who was cleaning up a storm, like the Energizer bunny with a mop in his hand. The president walked over to the janitor and told him he was the best janitor he has ever seen and the janitor replied, "Sir, I'm not just a janitor, I helped put a man on the moon." See, even though he was cleaning floors he had a bigger purpose and vision for his life. This is what kept him going and helped him excel in his job.