If the principle is unsound, we have no reason to expect the sun to rise to-morrow, to expect bread to be more nourishing than a stone, or to expect that if we throw ourselves off the roof we shall fall.
如果原则不,我们就没有理由期望太阳明天升起,没有理由期望面包比石头更有营养,或者期望如果我们从屋顶跳下去就会跌倒。