Napoleon was not really worse than many, not to say most, men. He was possessed of the very ordinary egoism that seeks its welfare at the expense of others. What distinguished him was merely the greater power he had of satisfying his will, and greater intelligence, reason and courage; added to which, chance gave him a favourable scope for his operations. By means of all this he did for his egoism what a thousand other men would like to do for theirs, but cannot. Every feeble lad who by little acts of villainy gains a small advantage for himself by putting others to some disadvantage, although it may be equally small, is just as bad as Napoleon.”
The quote is from On Human Nature.