要享受自由，我们必须控制自己。
不以法推行法度，则国事没有常规，办事的时候就没有规矩可循；法度不用法的手段推行，则政令不能贯彻。
The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.