Proverbs 27:19

restraining her is like restraining the wind,

or like grasping oil in his right hand.

Iron sharpens iron;

so a man sharpens his friend’s countenance.

Whoever tends the fig tree shall eat its fruit.

He who looks after his master shall be honored.

Sheol and Abaddon are never satisfied;

and a man’s eyes are never satisfied.

The crucible is for silver,

and the furnace for gold;

but man is refined by his praise.

Though you grind a fool in a mortar with a pestle along with grain,

yet his foolishness will not be removed from him.