I know nothing but the certainty of my own ignorance.
Improve yourself by other men's writings thus attaining effortlessly what they acquired through great difficulty.
The only thing I know is that I know nothing
Knowledge is our ultimate good.
The partisan when he is engaged in a dispute, cares nothing about the rights of the question, but is anxious only to convince his hearers of his own assertions.
Our purpose in founding the city was not to make any one class in it surpassingly happy, but to make the city as a whole as happyas possible.