Staying positive does not mean that things will turn out okay. Rather, it is knowing that you will be okay no matter how things turn out.
A nice old lady on a bus offers the driver some peanuts. He's happy to take some. He asks her after a while why she isn't having any herself.
"Oh, young man," she says, "they're too hard on my poor teeth, I couldn't."
"Why did you buy them at all then?" wonders the driver.
"You see, I just love the chocolate they're covered in!"