My advice to you is get married: if you find a good wife you'll be happy; if not, you'll become a philosopher.

Are you not ashamed of caring so much for the making of money and for fame and prestige, when you neither think nor care about wisdom and truth and the improvement of your soul?

I only know that I know nothing

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

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

Contentment is natural wealth, luxury is artificial poverty.

Do not trouble about those who practice philosophy, whether they are good or bad; but examine the thing itself well and carefully. And if philosophy appears a bad thing to you, turn every man from it, not only your sons; but if it appears to you such as I think it to be, take courage, pursue it, and practice it, as the saying is, 'both you and your house.

Mankind is made of two kinds of people: wise people who know they're fools, and fools who think they are wise.

True knowledge exists in knowing that you know nothing.