Proverbs 10:13
In the lips of him that hath understanding wisdom is found: but a rod is for the back of him that is void of understanding.
Your speech tells whether you are a fool or a wise man. A man with understanding has wise speech that helps others; a man without understanding speaks foolishly and benefits no one. You cannot hide your character for long. You cannot deceive others forever. You will be exposed (Pr 26:26; Eccl 5:3; 10:3). And if your speech indicates you are a fool, the best treatment for you in the wisdom of God is a good beating (Pr 18:6; 26:3).