Who said "An author's first duty is to let trade take its own course."?

This quote is attributed to Brendan Behan.

An author's first duty is to let trade take its own course. - Brendan Behan

"An author's first duty is to let trade take its own course."

Brendan Behan Literature

Playwright Novelist Irish 1923–1964

"I am a daylight atheist."

"There is no such thing as bad publicity except your own obituary."

"I respect kindness to great degree but I do not depend on it."

"The only thing to do with good advice is to pass it on."

"The pen is mightier than the sword."

"Literature opens the mind to new worlds"

"The interesting thing about books is that they're made of words."

"Literature captures the essence of what it means to be human."