Ecclesiastes 10:1-3; Ecclesiastes 10:12-15

1 Dead flies in perfume make it stink, And a little foolishness decomposes much wisdom. 2 Wise thinking leads to right living; Stupid thinking leads to wrong living. 3 Fools on the road have no sense of direction. The way they walk tells the story: "There goes the fool again!"
12 The words of a wise person are gracious. The talk of a fool self-destructs - 13 He starts out talking nonsense And ends up spouting insanity and evil. 14 Fools talk way too much, Chattering stuff they know nothing about. 15 A decent day's work so fatigues fools That they can't find their way back to town.