משלי יד:ג פירוש: רש״י

In a fool’s mouth is a staff of haughtiness A stick of haughtiness, like Pharaoh, who said (Ex. 5: 2): “Who is the Lord that I should hearken to His voice?”

but the lips of the wise guard them Heb. תשמורם, like תשמרם. They guard the wise.