Authors:

In both the art and the business worlds, the difference between the amateurs and the professionals is simple: The professionals know they're winging it. The amateurs pretend they're not.

"The Art of Asking". Book by Amanda Palmer, blog.amandapalmer.net. November 11, 2014.
In both the art and the business worlds, the difference between the amateurs and the professionals is simple: The professionals know they're winging it. The amateurs pretend they're not.