“When you say no, there is usually a short-term impact on the relationship. After all, when someone asks for something and doesn’t get it, his or her immediate reaction may be annoyance or disappointment or even anger. This downside is clear. The potential upside, however, is less obvious: when the initial annoyance or disappointment or anger wears off, the respect kicks in. When we push back effectively, it shows people that our time is highly valuable. It distinguishes the professional from the amateur.”

Greg McKeown, Essentialism (Page 138)