It is better to keep your mouth shut and appear stupid than to open it and remove all doubt Mark Twain?

Sadly it wasn't King Solomon or even Wright's mother who came up with that, but rather Abraham Lincoln, who was paraphrasing Proverbs 17:28, which says, "Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding."

King Solomon wrote the book of Proverbs, so it was he who came up with this gem of wisdom that Abraham Lincoln paraphrased.