Ecclesiastes 10:1-3

EasyEnglish Bible

10 A few dead flies in a bottle of perfume cause it to have a bad smell.
In the same way, one foolish thing can destroy a lot of wisdom.
² If you are wise,
    you know the right way to go.
But a fool is stupid and he goes the wrong way.
³ Even when fools walk along the road,
    they show that they are stupid.
Everyone can see that they are not wise.