Once a man knows good from evil, nothing on earth can compel him to act against that knowledge.

The only true wisdom is in knowing you know nothing.

I only know that I know nothing

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

The ancient Oracle said that I was the wisest of all the Greeks. It is because I alone, of all the Greeks, know that I know nothing.

No one knows whether death may not be the greatest of all blessings for a man, yet men fear it as if they knew it was the greatest of evils.

...[T]hese people... are my dangerous accusers; because those who hear them suppose that anyone who inquires into such matters... theories about the heavens... and everything below the earth... must be an atheist.

Knowledge is our ultimate good.

I know what I do not know.