George Santayana on wisdom

Those who cannot remember the past are condemned to repeat it.

Trust the man who hesitates in his speech and is quick and steady in action, but beware of long arguments and long beards.

Fanaticism consists of redoubling your efforts when you have forgotten your aim.

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.