There is, I believe, in every disposition a tendency to some particular evil, a natural defect, which not even the best education can overcome.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.  

爱是统一和凝聚的原则，争斗是分离和崩解的力量。

坚持志向是功绩地位的根本；不懒惰是各种善事的老师。