But the wicked suggestions of the witches had sunk too deep into the mind of Macbeth to allow him to attend to the warnings of the good Banquo. From that time he bent all his thoughts how to compass the throne of Scotland.
Macbeth had a wife, to whom he communicated the strange prediction of the weird sisters, and its partial accomplishment. She was a bad, ambitious woman, and so as her husband and herself could arrive at greatness, she cared not much by what means. She spurred on the reluctant purpose of Macbeth, who felt compunction at the thoughts of blood, and did not cease to represent the murder of the king as a step absolutely necessary to the fulfilment of the flattering prophecy.
It happened at this time that the king, who out of his royal condescension would oftentimes visit his principal nobility upon gracious terms, came to Macbeth's house, attended by his two sons, Malcolm and Donalbain, and a numerous train of thanes and attendants, the more to honour Macbeth for the triumphal success of his wars.
The castle of Macbeth was pleasantly situated, and the air about it was sweet and wholesome, which appeared by the nests which the martlet, or swallow, had built under all the jutting friezes and buttresses of the building, wherever it found a place of advantage; for where those birds most breed and haunt, the air is observed to be delicate. The king entered well-pleased with the place, and not less so with the attentions and respect of his honoured hostess, Lady Macbeth, who had the art of covering treacherous purposes with smiles; and could look like the innocent flower, while she was indeed the serpent under it.
The king being tired with his journey, went early to bed, and in his state-room two grooms of his chamber (as was the custom) slept beside him. He had been unusually pleased with his reception, and had made presents before he retired to his principal officers; and among the rest, had sent a rich diamond to Lady Macbeth, greeting her by the name of his most kind hostess.
Now was the middle of night, when over half the world nature seems dead, and wicked dreams abuse men's minds asleep, and none but the wolf and the murderer is abroad. This was the time when Lady Macbeth waked to plot the murder of the king. She would not have undertaken a deed so abhorrent to her sex, but that she feared her husband's nature, that it was too full of the milk of human kindness, to do a contrived murder. She knew him to be ambitious, but withal to be scrupulous, and not yet prepared for that height of crime which commonly in the end accompanies inordinate ambition. She had won him to consent to the murder, but she doubted his resolution; and she feared that the natural tenderness of his disposition (more humane than her own) would come between, and defeat the purpose. So with her own hands armed with a dagger, she approached the king's bed; having taken care to ply the grooms of his chamber so with wine, that they slept intoxicated, and careless of their charge. There lay Duncan in a sound sleep after the fatigues of his journey, and as she viewed him earnestly, there was something in his face, as he slept, which resembled her own father; and she had not the courage to proceed.
She returned to confer with her husband. His resolution had begun to stagger. He considered that there were strong reasons against the deed. In the first place, he was not only a subject, but a near kinsman to the king; and he had been his host and entertainer that day, whose duty, by the laws of hospitality, it was to shut the door against his murderers, not bear the knife himself. Then he considered how just and merciful a king this Duncan had been, how clear of offence to his subjects, how loving to his nobility, and in particular to him; that such kings are the peculiar care of Heaven, and their subjects doubly bound to revenge their deaths. Besides, by the favours of the king, Macbeth stood high in the opinion of all sorts of men, and how would those honours be stained by the reputation of so foul a murder!
In these conflicts of the mind Lady Macbeth found her husband inclining to the better part, and resolving to proceed no further. But she being a woman not easily shaken from her evil purpose, began to pour in at his ears words which infused a portion of her own spirit into his mind, assigning reason upon reason why he should not shrink from what he had undertaken; how easy the deed was; how soon it would be over; and how the action of one short night would give to all their nights and days to come sovereign sway and royalty! Then she threw contempt on his change of purpose, and accused him of fickleness and cowardice; and declared that she had given suck, and knew how tender it was to love the babe that milked her; but she would, while it was smiling in her face, have plucked it from her breast, and dashed its brains out, if she had so sworn to do it, as he had sworn to perform that murder. Then she added, how practicable it was to lay the guilt of the deed upon the drunken sleepy grooms. And with the valour of her tongue she so chastised his sluggish resolutions, that he once more summoned up courage to the bloody business.
So, taking the dagger in his hand, he softly stole in the dark to the room where Duncan lay; and as he went, he thought he saw another dagger in the air, with the handle towards him, and on the blade and at the point of it drops of blood; but when he tried to grasp at it, it was nothing but air, a mere phantasm proceeding from his own hot and oppressed brain and the business he had in hand.
Getting rid of this fear, he entered the king's room, whom he despatched with one stroke of his dagger. Just as he had done the murder, one of the grooms, who slept in the chamber, laughed in his sleep, and the other cried, "Murder," which woke them both; but they said a short prayer; one of them said, "God bless us!" and the other answered "Amen;" and addressed themselves to sleep again. Macbeth, who stood listening to them, tried to say, "Amen," when the fellow said, "God bless us!" but, though he had most need of a blessing, the word stuck in his throat, and he could not pronounce it.