因此，由于我们能在缺少实践的情况下掌握理性真理，那么从定义上讲，它们无法让我们了解自身所处的现实世界中的任何事。
Thus, because we can know rational truths without having to experience the world, then by definition they can tells us nothing about the world as we experience it.
如果你思考一下，就明白这是强大的真理。
That's a tremendously powerful truth, if you think about it.
即使在现金激励看起来合宜的情况下，你也会碰到人们不喜欢感到被人控制这一普遍的真理。
And even in situations where cash incentives might seem appropriate, you are liable to come up against the general truth that people hate to feel manipulated.
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