O mundo é um livro, e quem não viaja lê apenas uma página.

Innovation requires both creativity and rigorous testing.

Nothing is a waste of time if you use the experience wisely.

The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labor which is necessary for its production, and not on the greater or less compensation which is paid for that labor.

链条的强度取决于它最薄弱的一环，而生活终究是一条链条。