Ecclesiastes 10:2 KJV
A wise man’s heart is at his right hand; but a fool’s heart at his left.
Ecclesiastes 10:2, King James Version
In context
1 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.