Happiness is beneficial for the body, but it is grief that develops the powers of the mind.

仓库里没有积蓄备用的粮食，一旦遇到饥荒之年，就很难应付了。

Profit is important, but it should never come at the expense of our principles.

I think frugality drives innovation， just like other constraints do. One of the only ways to get out of a tight box is to invent your way out.