我不是商人，我就是生意本身。

对称性不仅是自然的一种属性，而且是寻找物理定律的指导原则。

教育者的心必须是一团活生生的火焰，是温暖和光明的源泉。

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.