The unexamined life is not worth living.

I know that I know nothing.

To find yourself, think for yourself.

True knowledge exists in knowing that you know nothing.

Wonder is the beginning of wisdom.

There is only one good, knowledge, and one evil, ignorance.

Be kind, for everyone you meet is fighting a hard battle.

The only true wisdom is in knowing you know nothing.

He who is not contented with what he has, would not be contented with what he would like to have.

Contentment is natural wealth, luxury is artificial poverty.

The secret of change is to focus all of your energy not on fighting the old, but on building the new.

Strong minds discuss ideas, average minds discuss events, weak minds discuss people.

By all means marry; if you get a good wife, you'll become happy; if you get a bad one, you'll become a philosopher.

Education is the kindling of a flame, not the filling of a vessel.

Let him who would move the world first move himself.

I cannot teach anybody anything. I can only make them think.

Not life, but good life, is to be chiefly valued.

The way to gain a good reputation is to endeavor to be what you desire to appear.

I am the wisest man alive, for I know one thing, and that is that I know nothing.

One who is injured ought not to return the injury, for on no account can it be right to do an injustice.

No evil can happen to a good man, either in life or after death.

Prefer knowledge to wealth, for the one is transitory, the other perpetual.

Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for.

It is better to change an opinion than to persist in a wrong one.

False words are not only evil in themselves, but they infect the soul with evil.

The children now love luxury; they have bad manners, contempt for authority; they show disrespect for elders and love chatter in place of exercise.

The greatest way to live with honor in this world is to be what we pretend to be.

Beware the barrenness of a busy life.

From the deepest desires often come the deadliest hate.

If a man is proud of his wealth, he should not be praised until it is known how he employs it.

Understanding a question is half an answer.

When the debate is lost, slander becomes the tool of the loser.

An honest man is always a child.

Regard your good name as the richest jewel you can possibly be possessed of.

Death may be the greatest of all human blessings.

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

Wise men speak because they have something to say; Fools because they have to say something.

The measure of a man is what he does with power.

Human behavior flows from three main sources: desire, emotion, and knowledge.

One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors.

Courage is knowing what not to fear.

Opinion is the medium between knowledge and ignorance.

Music is a moral law. It gives soul to the universe, wings to the mind, flight to the imagination, and charm and gaiety to life and to everything.

The first and greatest victory is to conquer yourself.

You can discover more about a person in an hour of play than in a year of conversation.

Necessity is the mother of invention.

We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.

At the touch of love everyone becomes a poet.

The price good men pay for indifference to public affairs is to be ruled by evil men.

Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws.