'Mouth of Fools' in the Bible

The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.

The heart of him that hath understanding seeketh knowledge: but the mouth of fools feedeth on foolishness.

The legs of the lame are not equal: so is a parable in the mouth of fools.

As a thorn goeth up into the hand of a drunkard, so is a parable in the mouth of fools.