One should speak the truth not talk at length - Democritus
It takes two to speak the truth--one to speak another to hear. - Henry David Thoreau
It is now necessary to warn the writer that her concern for the reader must be pure: She must sympathize with the reader's plight (most readers are in trouble about half the time). - E.B. White {modified paraphrase}
Writing is easy. All you do is stare at a blank sheet of paper until drops of blood form on your forehead. - Gene Fowler