Moreover, we feel some quality of necessity about the proposition 'two and two are four', which is absent from even the best attested empirical generalizations.

此外，我们感到“二加二等于四”这一命题具有一定的必然性，即使是最可靠的实证概括也不存在这一点。

This illustrates the difference between general propositions known a priori such as 'two and two are four', and empirical generalizations such as 'all men are mortal'.

这说明了先验已知的一般命题（例如“二和二等于四”）与经验概括（例如“所有人都会死”）之间的区别。

Thus the difference between an a priori general proposition and an empirical generalization does not come in the meaning of the proposition; it comes in the nature of the evidence for it.

因此，先验一般命题与经验概括之间的区别并不在于命题的意义； 它来自于它的证据的性质。

Thus our knowledge of the general propositions of mathematics (and the same applies to logic) must be accounted for otherwise than our (merely probable) knowledge of empirical generalizations such as 'all men are mortal'.

因此，我们对数学一般命题的知识（这同样适用于逻辑）必须以其他方式来解释，而不是我们对经验概括的（仅仅是可能的）知识，例如“所有人都会死”。