In fact, the truth of the principle is impossible to doubt, and its obviousness is so great that at first sight it seems almost trivial.

事实上，这个原理的真实性是毋庸置疑的，而且它的显而易见性如此之大，乍一看似乎微不足道。

But despite its obviousness, Seneca observed then, and it can certainly still be observed now, that most of us remain incapable of living as if.

然而， 尽管这一点显而易见， 塞涅卡当时就观察到，而且现在仍然可以观察到，我们大多数人仍然无法像那样生活。

The principles of inference are apt to be overlooked because of their very obviousness—the assumption involved is assented to without our realizing that it is an assumption.

推理原则很容易被忽视，因为它们非常明显——所涉及的假设在我们没有意识到这是一个假设的情况下得到了认同。