你的时间有限，所以不要浪费在过别人的生活上。

Be nice to your children because they are going to choose your nursing home.

Happiness is not a right; it is a rare and precious exception.

I am convinced that the substitution of a simple tax on the rent of land for the complicated taxes which at present oppress industry would be advantageous to all classes.

学习数学的最好方法就是去做数学。