
The portion after the second semicolon is widely paraphrased or misquoted. Two examples are "For every complex problem there is an answer that is clear, simple, and wrong" and "There is always an easy solution to every human problem -- neat, plausible, and wrong."
1910s
Source: "The Divine Afflatus" in New York Evening Mail (16 November 1917); later published in Prejudices: Second Series (1920) and A Mencken Chrestomathy (1949)