Asked if being a copywriter is an advantage to the fiction writer, Knopf replies:
The greatest challenge every writer faces is the blank page. Something has to get you to start writing stuff down. This can be extremely daunting if your only motivation is sheer will power. When you’re a professional copywriter there are plenty of people more than willing to relieve you of this personal responsibility. Clients, for example, and their proxies – creative directors, account executives and spouses interested in paying mortgages. So what you must learn right out of the gate is to write something quickly, under intense deadline pressure, that’s good enough to allow you to keep writing and keep getting paid.
In other words, copywriters produce. Or they are no longer copywriters. And the same can be said of authors of fiction or any other form.