In both his books and speeches, Donald Trump often mentions a story that his father told him when he was a child that goes something like this: There once was an entrepreneur who started a soda company called Three Up. Despite the man's passion for his company, though, Three Up eventually went under. Undeterred, the entrepreneur started another cola company called Four Up, which also went bankrupt. He persisted on, but after Five Up and Six Up failed as well, the man was tired of struggling and gave up. A short time later another company came along and invented 7 Up, which was wildly successful. The point of the story, according to Trump, is that if the man hadn't quit, he would have created 7 Up. If you're a job seeker, you can probably relate to the entrepreneur in the story. It may seem hard to stay motivated in the face of rejection and success can seem elusive -- you might even feel like giving up on your job search or settling for a job you don't really like. But, if you quit when the going gets tough, you may miss out on the opportunity of a lifetime -- like the entrepreneur did. The job search blues can certainly be tough to conquer -- but it can be done. Here's how to get through the tough times in a job search.