The fool learns by suffering.
A sparing tongue is the greatest treasure among men.
But they who give straight judgements to strangers and to those of the land and do not transgress what is just, for them the city flourishes and its people prosper.
Invite your friend to a feast, but leave your enemy alone; and especially invite the one who lives near you.
Man's chiefest treasure is a sparing tongue.
Aegis-bearing Zeus has a design for each occasion, and mortals find this hard to comprehend.