Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

archive.org | --> | 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."