The end of life is happiness， and happiness is tranquility.

预测未来的最好方法就是发明它。

The function of entrepreneurs is to reform or revolutionize the pattern of production by exploiting an invention or, more generally, an untried technological possibility for producing a new commodity or producing an old one in a new way.

The essence of a free government consists in an effectual control of rivalries.

"The greatest battles are fought within the silent chambers of our own hearts."

I don't think you need to be sad to write a sad song.