Probably the greatest harm done by vast wealth is the harm that we of moderate means do ourselves when we let the vices of envy and hatred enter deep into our own natures.
I have never in my life envied a human being who led an easy life; I have envied a great many people who led difficult lives and led them well.
The two feelings, envy and arrogance, are but opposite sides of the same shield, but different developments of the same spirit. A Square Deal (1903)