Hesiod on wisdom

Observe due measure, for right timing is in all things the most important factor.

Often an entire city has suffered because of an evil man.

He harms himself who does harm to another, and the evil plan is most harmful to the planner.

The only true wisdom is in knowing you know nothing.

Socrates470–399 BC

By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.

Confucius551–479 BC

True wisdom comes to each of us when we realize how little we
understand about life, ourselves, and the world around us.