A wise man's heart is at his right hand, But a fool's heart at his left.
Ecclesiastes 10:2
Surrounding context
10:1 Dead flies putrefy the perfumer's ointment, And cause it to give off a foul odor; So does a little folly to one respected for wisdom and honor.
10:2 A wise man's heart is at his right hand, But a fool's heart at his left.
10:3 Even when a fool walks along the way, He lacks wisdom, And he shows everyone that he is a fool.