Putting anything in the R line

How do you know if something can really go in the R line? There are some things out of our control. For example, I could say and live in the idea of getting a certain job and believe it’s possible, but ultimately someone else could get hired. Does that mean they just believed harder or does that mean the employer just happened to like them better? Where do you draw the line between reality/out of our control and believing in our impossible goal?