人为某样东西实际支付的成本至少是标价的两倍，因为买来后设置、学习、维护、修理，以及最后处置，也需要耗费精力、时间和钱。不是所有的实际成本都在价签上。实际成本是标价的2倍。

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.

所以,音乐越繁复,治国的成绩越少。因此来看,音乐不是用来治理天下的啊！

You see, in life, lots of people know what to do, but few people actually do what they know. Knowing is not enough! You must take action.

一本怀有恶意的书籍将不会伤害到任何人，除了写作它的傻瓜。

我们都面临着一系列被巧妙地伪装成不可能情况的伟大机会。