We noted in the preceding chapter the three principles commonly called 'laws of thought'.

我们在前一章中提到了通常称为“思维法则” 的三个原则。

But the conclusion that the law of contradiction is a law of thought is nevertheless erroneous.

但是矛盾律是思维规律的结论仍然是错误的。

Now what makes it natural to call this principle a law of thought is that it is by thought rather than by outward observation that we persuade ourselves of its necessary truth.

现在，将这个原则称为思想法则是很自然的，因为我们是通过思想而不是通过外在观察说服自己相信它的必要真理​​。