From the Q&A section (found July 2010) http://www.philip-pullman.com/q_a.asp?offset=60
Pullman's website
Context: If you're going to make a living at this business - more importantly, if you're going to write anything that will last - you have to realise that a lot of the time, you're going to be writing without inspiration. The trick is to write just as well without it as with. Of course, you write less readily and fluently without it; but the interesting thing is to look at the private journals and letters of great writers and see how much of the time they just had to do without inspiration. Conrad, for example, groaned at the desperate emptiness of the pages he faced; and yet he managed to cover them. Amateurs think that if they were inspired all the time, they could be professionals. Professional know that if they relied on inspiration, they'd be amateurs.
“It is particularly displeasing to hear professional critics using the term "layman" to describe people who are amateurs and patrons of those arts with which they are themselves professionally concerned. The fact that the critic gets money for knowing something, and giving public expression to his opinion, does not entitle him to consider the amateur, who may be as well informed and as sensitive as himself, an outsider.”
A Voice from the Attic (1960)
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Robertson Davies 282
Canadian journalist, playwright, professor, critic, and nov… 1913–1995Related quotes
“An old maxim says that a professional writer is an amateur who didn't quit”
A Gift of Wings (1974)
Source: https://books.google.de/books?id=InUpHgnif58C&pg=PA9&lpg=PA9&dq=An+old+maxim+says+that+a+professional+writer+is+an+amateur+who+didn%27t+quit&source=bl&ots=RpDceaKvsx&sig=ACfU3U0n2qLBUs3E_5CDTfLDvLPmk3tB7A&hl=de&sa=X&ved=2ahUKEwiB16L5_5jyAhWlgf0HHeQyD2oQ6AF6BAgREAM#v=onepage&q=An%20old%20maxim%20says%20that%20a%20professional%20writer%20is%20an%20amateur%20who%20didn't%20quit&f=false A Gift of Wings
“Only amateurs attack machines; professionals target people.”
Semantic Attacks: The Third Wave of Network Attacks, 2000-10-15, Schneier, Bruce, Schneier on Security blog, 2010-08-31 http://www.schneier.com/crypto-gram-0010.html#1,
Source: The compleat violinist: thoughts, exercises, reflections of an itinerant violinist http://books.google.co.in/books?id=qC0xAQAAIAAJ, Summit Books, 1 April 1986, p. 79
“You politicians remain professional because the voters remain amateur.”
Source: World Commodities and World Currencies (1944), Chapter X, Commodity Unit Stabilization, p. 109