Ecclesiastes 10:1-3

Authorized (King James) Version

10 Dead flies cause the ointment of the apothecary to send forth a stinking savour:
so doth a little folly him that is in reputation for wisdom and honour.
² A wise man’s heart is at his right hand;
but a fool’s heart at his left.
³ Yea also, when he that is a fool walketh by the way, his wisdom faileth him,
and he saith to every one that he is a fool.