Macbeth is one of the seven supreme Shakespearean plays. In the order of composition it is either the fourth or the fifth of the seven. In point of merit it is neither greater nor less than the other six. It is different from them, in that it belongs more wholly to the kingdom of vision.
Like most Shakespearean tragedy, Macbeth is the tragedy of a man betrayed by an obsession. Cæsar is betrayed by an obsession of the desire of glory, Antony by passion, Tarquin by lust, Wolsey by worldly greed, Coriolanus and Timon by their nobleness, Angelo by his righteousness, Hamlet by his wisdom. All fail through having some hunger or quality in excess. Macbeth fails because he interprets with his worldly mind things spiritually suggested to him. God sends on many men "strong delusion, that they shall believe a lie." Othello is one such. Many things betray men. One strong means of delusion is the half-true, half-wise, half-spiritual thing, so much harder to kill than the lie direct. The sentimental treacherous things, like women who betray by arousing pity, are the dangerous things because their attack is made in the guise of great things. Tears look like grief, sentiment looks like love; love feels like nobility; spiritualism seems like revelation.
Among these things few are stronger than the words spoken in unworldly states, in trance, in ecstasy, by oracles and diviners, by soothsayers, by the wholly excited people who are also half sane, by whoever obtains a half knowledge of the spirit by destruction of intellectual process.
"to win us to our harm,
The instruments of darkness tell us truths,
Win us with honest trifles, to betray's
In deepest consequence."
Coming weary and excited from battle, on a day so strange that it adds to the strangeness of his mood, Macbeth hears the hags hail him with prophecy. The promise rankles in him. The seed scattered in us by the beings outside life comes to good or evil according to the sun in us. Macbeth, looking on the letter of the prophecy, thinks only of the letter of its fulfilment, till it becomes an obsession with him. Partial fulfilment of the prophecy convinces him that all will be fulfilled. The belief that the veil over the future has been lifted for him gives him the recklessness of one bound in the knots of fate. So often, the thought that the soul is in a trap, playing out something planned of old, makes man take the frantic way, when the smallest belief in life would lead to peace. This thought passes through his mind. Then fear that it is all a contriving of the devils makes him put it manfully from his mind. The talk about the Cawdor whose place he holds is a thrust to him. That Cawdor was a traitor who has been put to death for treachery. The king had an "absolute trust" in him; but there is no judging by appearances. This glimpse of the ugliness of treachery makes Macbeth for an instant free of all temptation to it. Then a word stabs him again to the knowledge that if he take no step the king's young son will be king after Duncan. Why should the boy rule? From this point he goes forward, full of all the devils of indecision, but inclining towards righteousness, till his wife, girding and railing at him with definite aim while all his powers are in mutiny, drives him to the act of murder.
The story of the double treachery of the killing of a king, who is also a guest, is so written that we do not feel horror so much as an unbearable pity for Macbeth's mind. The horror is felt later, when it is made plain that the treachery does not end with that old man on the bed, but proceeds in a spreading growth of murder till the man who fought so knightly at Fife is the haunted awful figure who goes ghastly, killing men, women and little children, till Scotland is like a grave. At the end, the "worthy gentleman," "noble Macbeth," having fallen from depth to depth of degradation, is old, hag-haunted, sick at heart, and weary. He has no friends. He knows himself silently cursed by every one in his kingdom. His queen is haunted. There is a curse upon the pair of them. The birds of murder have come to roost. All that supports him is his trust in his reading of the words of the hags. He knows himself secure.
"And you all know security
Is mortal's chiefest enemy,"
He has supped full with horrors. His bloody base mind is all a blur with gore. But he is resolute in evil still. At the end he sees too late that he has been tricked by—
"the equivocation of the fiend
That lies like truth."
His queen has killed herself. All the welter of murder has been useless. All that he has done is to damn his soul through the centuries during which the line of Banquo will reign. He dies with a courage that is half fury against the fate that has tricked him.