Marxian Socialism must always remain a portent to the historians of Opinion — how a doctrine so illogical and so dull can have exercised so powerful and enduring an influence over the minds of men， and， through them， the events of history.

我不是低语，我是呼喊。

The defining characteristic of pessimists is that they tend to believe bad events will last a long time, will undermine everything they do, and are their own fault.

释义：要了解过去和现在，以便灵活应变，适应变化。