"Do not depend on the hope of results ...concentrate on the value...and the truth of the work itself."
Ok, I'll admit, this is not the complete quotation, and this bit is taken out of context. Bill Moyers used it in his address to the National Conference on Media Reform. Still, it struck me as applicable to the making of art.
If you read the entire quotation, though, you will find it says something quite different, that Merton is going someplace else with this initial thought. Less art related, but I can't disagree with his conclusion.