never apologize, never explain

A little magazine editor is often asked by a rejected author to explain the reason for his/her rejection. Which always reminds me of the line spoken by the character Capt. Nathan Cutting Brittles (played by John Wayne) in the 1949 western She Wore a Yellow Ribbon: "Never apologize and never explain—it's a sign of weakness."

[She Wore a Yellow Ribbon, screenplay by Frank S. Nugent and Laurence Stallings.]