7 “The proud have hidden a trap for me”. He has briefly described the whole body of the devil, when he says, “the proud.” Hence is it that for the most part they call themselves righteous when they are unrighteous. Hence is it that nothing is so grievous to them as to confess their sins. They are men who, being falsely righteous, must needs envy the truly righteous. For none envies another in that which he wishes not either to be or to seem....Hence come all allurings and trippings up of others. This the devil first wished, when falling himself he envied man who stood....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)