He was useful because he had been instructed; and what he knew was this - that should the water in that transparent thing disappear, the evil spirit inside the boiler would get angry through the greatness of his thirst, and take a terrible vengeance.

This exert tells of how a uneducated worker works tirelessly in order to keep the evil spirit, that he believes will cause great harm, from doing so. While reading this, I thought of the old saying "ignorance is bliss", for due to the man's ignorance is does much more apt to do work, but ultimately the saying doesn't apply for unfortunatly there is very little bliss in this work.