Envy
Of all the characteristics of ordinary human nature envy is the most unfortunate; not only does the envious person wish to inflict misfortune and do so whenever he can with impunity, but he is also himself rendered unhappy by envy. Instead of deriving pleasure from what he has, he derives pain from what others have. If he can, he deprives others of their advantages, which to him is as desirable as it would be to secure the same advantages himself. If this passion is allowed to run riot it becomes fatal to all excellence, and even to the most useful exercise of exceptional skill. Why should a medical man go to see his patients in a car when the labourer has to walk to his work?
— Bertrand Russel, The Conquest of Happiness