Men are four:
He who knows not and knows not he knows not, he is a fool-shun him;
He who knows not and knows he knows not, he is simple—teach him;
He who knows and knows not he knows, he is asleep-wake him;
He who knows and knows he knows, he is wise—follow him!
一个人的价值不是看他得到了多少，而是他付出了多少。