If only closed minds came with closed mouths.

The saying mocks the tendency of “closed minds”—people unwilling to consider new evidence or perspectives—to speak the most loudly or confidently. By wishing that closed-mindedness also “closed” the mouth, it implies that intellectual rigidity often pairs with unsolicited opinions, dogmatism, or performative certainty. The humor comes from treating “closed” as a physical mechanism: if the mind is shut, the mouth should be too. As a social critique, it champions intellectual humility and open inquiry, suggesting that speaking less (and listening more) is preferable when one is not prepared to think expansively or revise one’s views.