Have you ever noticed that you go somewhere and you see someone, whom you don't even know, you feel a strong rejection and say to yourself: I'm not going to sit next to that person? It is very likely that this sensation has been caused by a memory that you have accumulated in your subconscious mind.
It is the result of a judgment based solely on a memory you have. Most of the time they are memories of other lifetimes, that's why we react. Actually, you have no idea what is going on, and without knowing it, you are "labeling" that person.
Many times a problem is also a "label". Most of the circumstances we go through and the people we share with, end up labeled by our intellect that thinks it knows. "This is right", "this is wrong", "this person should...".