国必有诽誉，忠臣令诽在己，誉在上。
解释：国家每做一件事必然是有毁谤也有赞美，忠臣把毁谤都加在自己身上，而把赞美都归于君主。
科学严谨性绝不能因商业压力而妥协。
I don’t have to prove anything to anyone. I only have to follow my heart and concentrate on what I want to say to the world. I run my world.
The only way to do great work is to love what you do.
In mathematics, you don't understand things. You just get used to them.
Ingersoll's story of the man that went down from heaven on a reduced-rate excursion ticket good for 30 days --- and tried to sell his return ticket.