If thou continuous to take delight in idle argumentation thou mayest be qualified to combat with the sophists, but will never know how to live with men.

In all of us, even in good men, there is a lawless wild-beast nature, which peers out in sleep.

I know one thing, that I know nothing.

True knowledge exists in knowing that you know nothing.

The man who is truly wise knows that he knows very little.

Let he who would move the world, first complete an environmental impact assessment and a 90-day public comment period.

I am that gadfly which God has attached to the state, and all day long and in all places am always fastening upon you, arousing and persuading and reproaching you.