“How you see the world depends on where you sit. People tend to see what they want to see. Out of a mass of detailed information, they tend to pick out and focus on those facts that confirm their prior perceptions and to disregard or misinterpret those that call their perceptions into question. Each side in a negotiation may see only the merits of its case, and only the faults of the other side’s.
The ability to see the situation as the other side sees it, as difficult as it may be, is one of the most important skills a negotiator can possess. It is not enough to know that they see things differently. If you want to influence them, you also need to understand empathetically the power of their point of view and to feel the emotional force with which they believe in it. It is is not enough to study them like beetles under a microscope; you need to know what it feels like to be a beetle….”
– Roger Fisher & William Ury in”Getting to Yes : Negotiating Agreement Without Giving in”