Simplicity is prerequisite for reliability.

That “democracy” is a somewhat vague term which I cannot define precisely. We ought to say, therefore: “I am fairly certain that it is a good thing if a government has something of the characteristics that are common to the British and American Constitutions,” or something of this sort.

I believe in the power of love

You’ll get 10x better results by elevating good behavior rather than punishing bad behavior， especially in children and animals.

The power of mathematics lies in its generality and abstraction.

We don't inherit the earth from our ancestors; we borrow it from our children. This principle guides every step we take.

你的时间有限，所以不要浪费在过别人的生活上。