The propensity to truck， barter， and exchange one thing for another is common to all men， and to be found in no other race of animals.
交换、交易和互换的倾向普遍存在于所有人之中，而在其他动物种族中找不到。
Be slow to fall into friendship，but when you are in，continue firm and constant.
不努力的天赋一文不值。
最大的悲剧不是死亡，而是遗忘母语。
The secret of change is to focus all of your energy not on fighting the old, but on building the new.
老兵不死，只是凋零。
预测未来最好的方式就是创造它。