Let us see if Nature was not fortunate in finding the Porter at his post at an hour when he was needed as never before.
The air around the castle of Macbeth "nimbly and sweetly" recommended itself to Duncan's senses; and Banquo noticed that the swallow, most confiding and unsuspicious of birds, approves the place "by his lov'd mansionry." On every frieze, buttress, coigne of vantage, Nature had colonized this domestic wing, as if to hint to the wayfarer "a pleasant seat," peace and unviolated sleep within. But we remember that a raven had croaked the fatal entrance of Duncan into the castle. The swallows twittering in the delicate air cannot drown this omen of insecurity: as we enter with the unconscious Duncan, the weird sisters slip by us from their blasted heath, and the house darkens with a fated purpose.
It was an unruly night, and the owl clamored the livelong hours. Towards morning, after the accomplishment of the murder, Lady Macbeth snatched the bloody daggers from the hand of her husband to carry them back into the chamber. The air that was interrupted at the lips of the gracious Duncan seems breathless as he, appalled at the deed; and our consciousness of it sinks into an awful silence. Just then a knocking at the gate is heard.
De Quincey, in an essay "On the Knocking at the Gate," rightly notices that it reflects "back upon the murder a peculiar awfulness and depth of solemnity," and he explains this effect. "When the deed is done, when the work of darkness is perfect, then the world of darkness passes away like a pageantry in the clouds: the knocking at the gate is heard, and it makes known audibly that the reaction has commenced; the human has made its reflux upon the fiendish; the pulses of life are beginning to beat again; and the re-establishment of the goings-on of the world in which we live first makes us profoundly sensible of the awful parenthesis that had suspended them."
Admirable as this criticism is to justify the profound art of Shakspeare, it does not seem to me entirely to exhaust the effect produced by the knocking. It not only makes known to us that human life recurs, and thus emphasizes our sense of the unhuman world of murder, but it also startles us with the sudden consciousness that the human which thus recurs does it in entire ignorance of the scene at which it knocks. That makes us catch our breath, to feel how thoughtlessly life is about to stumble into the tremendous scene. What a contrast of innocent unconsciousness,—so innocent, so remote from the event, that we should think it was impertinent if our pity for the shock it brings upon itself did not prevail! We wonder who will first discover what has occurred, whether man or woman; somebody is doomed to blunder into the ghastliness of that room where Macbeth murdered sleep. What will be the sensation that thrills from the inhospitable bed around which the angels of honor and loyalty ought to have watched with spotless wings? Some one steps into this pool where all the safeguards and trusts of human life lie drenched. How will he manage to escape from it, and will the tongue be palsied "with the act of fear" to refuse to the lips words adequate to express the villainy? And yet this must be done.
We therefore become aware of this additional feeling, that the life which knocks at the gate, though unconscious, is pregnant with the design of an overruling Power; just for a moment, there seems to be the supernatural arrival of something with a commission to detect the murder. Every knock smites the bare heart of Macbeth, who may well exclaim, "Wake Duncan with thy knocking! I would thou could'st!"
Shakspeare makes another world for Macbeth,—a sequestered hell. The knocking announces the existence and reappearance of another life, as De Quincey notices; but he does not note the fine prolongation of the Hell into the humorous fancy of the Porter who comes to open the gate.
To the old French taste, this Porter was one of the Shakspearean violations of decency and tragic sentiment,—a vulgar fellow who has been waked out of a drunken sleep, and who talks outrageous matter that is the farthest removed from murder, so that solemnity is affronted and abruptly leaves the hearts which it had just monopolized. But the more we dwell upon Shakspeare's characters, "the more we shall see proofs of design and self-supporting arrangement, where the careless eye had seen nothing but accident."
The Porter, as if he had been privy to the transactions of the night, translates each knock into a candidate for admission into his quaint fancy of a hell, of which he keeps the gate. Fleay, in his "Shakspeare's Manual," shows that the Porter makes allusions to contemporaneous circumstances of the year 1606, when "Macbeth" was first produced. "The expectation of plenty:" wheat, barley, and malt were extraordinarily cheap. The "equivocator" is the Jesuit, Garnet, who was tried for gunpowder treason in that year. "Stealing out of a French hose:" the fashion of hose became short in 1606; yet the tailors took the old measure of material and cabbaged the difference. So that the Porter belongs to that year, and could not have been subsequently interpolated.
"If a man were porter of hell-gate, he should have often turning the key. Who's there?" "An equivocator, that could swear in both the scales against either scale; who committed treason enough for God's sake, yet could not equivocate to Heaven! Oh, come in, equivocator!" Yes, this is the very house for him to come to, where a treason has just been committed which will be unable to equivocate to Heaven. "I'll devil-porter it no farther: I had thought to have let in some of all professions, that go the primrose way to the everlasting bonfire." If the outer life is to gain admission at all again to this castle, this grotesque hint of the hell within undoes the gate appropriately: by no abrupt transition, and by the bridge of a perilous smile, human life is reached again. The Porter delays by his successive fancies, till we begin to grow impatient, like those emissaries of Heaven who shiver at the gate. This impatience, humorously created for us, introduces another human feeling to qualify our awe; and thus we rejoin our common humanity.