From Wikipedia --
"It refers to a hypothetical situation wherein an ass [donkey] that is equally hungry and thirsty is placed precisely midway between a stack of hay and a pail of water. Since the paradox assumes the ass will always go to whichever is closer, it will die of both hunger and thirst since it cannot make any rational decision to choose one over the other."
In other words, don't just stand there between good alternatives, doing nothing, until opportunities have passed you by. If two things are really equally valuable, just pick one and go get it first.
Or as Jason Shen said yesterday, "When you're paralyzed and not moving, you're spending part of your time thinking, 'Is what I'm doing the right thing? Should I be doing something else entirely?' But you often wind up doing nothing, which is the worst thing possible."
Pick something, keep moving.