The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
The great philosophers are those who have made a difference in the way we think about the world and our place in it.
“I give my whole water in joy，“ sings the waterfall， '' though little of it is enough for the thirsty。''
释义：跟交情浅的朋友说过深的话题，是愚蠢的；生活贫困的人总是希望得到富贵者的施舍，是糊涂的；没有取得他人的信任就进献忠言，会被误解为批评。