text:  Can any argument be conceived which is more decisive in favour of the moral economy to which even this lower world is subject than the undeniable fact that virtue is fortified by exercise and pain conquered by endurance; while vice like the bearer of the sibyl's books extorts every hour a greater sacrifice for less enjoyment? The passage in Mammon's speech is no less philosophically accurate than it is poetically beautiful-- "Out torments also may in length of time Become our elements these piercing fires As soft as now severe our temper changed Into their temper which must needs remove The sensible of pain