" When you say that you have a policy, you are signaling that your No is not a one-time message but an ongoing practice to which you have given a lot of thought. It is a signal of resolve, a sign that you will not budge. Of course, this phrase is not to be used lightly or misleadingly as a rigid adversarial position; it works when it is indeed your policy, something you have thought through. "

― William Ury , The Power of a Positive No: How to Say No and Still Get to Yes