Wonder is the beginning of all wisdom.

Nothing is to be preferred before justice.

The really important thing is not to live, but to live well. And to live well meant, along with more enjoyable things in life, to live according to your principles.

I know that I know nothing.

Follow the argument wherever it leads.

You are wrong, sir, if you think that a man who is any good at all should take into account the risk of life or death; he should look to this only in his actions, whether what he does is right or wrong, whether he is acting like a good or a bad man.

People learn more on their own rather than being force fed.