Ecclesiastes 10:12-15

The words of a wise man’s mouth are gracious and win him favor, but the lips of a fool consume him; the beginning of his talking is foolishness and the end of his talk is wicked madness. Yet the fool multiplies words, though no man knows what will happen, and who can tell him what will come after he is gone? The labor of a fool so wearies him [because he is ignorant] that he does not even know how to go to a city.