Do not boast about tomorrow, for you do not know what a day may bring forth.
Let another praise you and not your own mouth; a stranger, and not your own lips.
Better is open rebuke than love that is concealed. Faithful are the wounds of a friend, but deceitful are the kisses of an enemy.
A prudent man sees evil and hides himself; the naive proceed and pay the penalty.
Iron sharpens iron; so one man sharpens another.
Though you pound a fool in a mortar with a pestle along with crushed grain, yet his foolishness will not depart from him.