
“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