The leading features in the character of Macbeth are striking enough, and they form what may be thought at first only a bold, rude, Gothic outline.  By comparing it with other characters of the same author we shall perceive the absolute truth and identity which is observed in the midst of the giddy whirl and rapid career of events.  Macbeth in Shakespeare no more loses his identity of character in the fluctuations of fortune or the storm of passion, than Macbeth in himself would have lost the identity of his person.  Thus he is as distinct a being from Richard III as it is possible to imagine, though these two characters in common hands, and indeed in the hands of any other poet, would have been a repetition of the same general idea, more or less exaggerated.  For both are tyrants, usurpers, murderers, both aspiring and ambitious, both courageous, cruel, treacherous.  But Richard is cruel from nature and constitution.  Macbeth becomes so from accidental circumstances.  Richard is from his birth deformed in body and mind, and naturally incapable of good.  Macbeth is full of ’the milk of human kindness, is frank, sociable, generous.  He is tempted to the commission of guilt by golden opportunities, by the instigations of his wife, and by prophetic warnings.  Fate and metaphysical aid conspire against his virtue and his loyalty.  Richard, on the contrary, needs no prompter, but wades through a series of crimes to the height of his ambition from the ungovernable violence of his temper and a reckless love of mischief.  He is never gay but in the prospect or in the success of his villanies; Macbeth is full of horror at the thoughts of the murder of Duncan, which he is with difficulty prevailed on to commit, and of remorse after its perpetration.  Richard has no mixture of common humanity in his composition, no regard to kindred or posterity, he owns no fellowship with others, he is ’himself alone’.  Macbeth is not destitute of feelings of sympathy, is accessible to pity, is even made in some measure the dupe of his uxoriousness, ranks the loss of friends, of the cordial love of his followers, and of his good name, among the causes which have made him weary of life, and regrets that he has ever seized the crown by unjust means, since he cannot transmit it to his own posterity: 

     For Banquo’s issue have I ’fil’d my mind—­
     For them the gracious Duncan have I murther’d,
     To make them kings, the seed of Banquo kings.

In the agitation of his thoughts, he envies those whom he has sent to peace.  ’Duncan is in his grave; after life’s fitful fever he sleeps well.’  It is true, he becomes more callous as he plunges deeper in guilt, ’direness is thus rendered familiar to his slaughterous thoughts’, and he in the end anticipates his wife in the boldness and bloodiness of his enterprises, while she, for want of the same stimulus of action, is ’troubled with thick-coming fancies that rob her of her rest’, goes mad and dies.