Arkady and Boris Strugatsky. Hard to be God (№ 5734)

Evil is ineradicable. No man is able to reduce its amount in the world. He can slightly improve his own fate, but always at the expense of the fate of others. And always will be the kings, more or less violent, barons, more or less wild, and will always be ignorant people that feed the admiration of their oppressors, and the hatred of his liberator. And all because a slave is much better to understand their master, even the most cruel than his liberator, for each slave presents herself well in Mr, but few is yourself to be the selfless liberator. These people don Rumata, and this is our world.