Is this a dagger which I see before me - William Shakespeare

Is this a dagger which I see before me,
The handle toward my hand? Come, let me clutch thee:—
I have thee not, and yet I see thee still.
Art thou not, fatal vision, sensible
To feeling as to sight? or art thou but
A dagger of the mind, a false creation,
Proceeding from the heat-oppressèd brain?
I see thee yet, in form as palpable
As this which now I draw.
Thou marshal’st me the way that I was going;
And such an instrument I was to use.
Mine eyes are made the fools o’ the other senses,
Or else worth all the rest: I see thee still;
And on thy blade and dudgeon gouts of blood,
Which was not so before.—There ’s no such thing:
It is the bloody business, which informs
Thus to mine eyes.—Now o’er the one half world
Nature seems dead, and wicked dreams abuse
The curtained sleep; witchcraft celebrates
Pale Hecate’s offerings; and withered murder,
Alarumed by his sentinel, the wolf,
Whose howl’s his watch, thus with his stealthy pace,
With Tarquin’s ravishing strides, towards his design
Moves like a ghost.—Thou sure and firm-set earth,
Hear not my steps, which way they walk, for fear
The very stones prate of my whereabout,
And take the present horror from the time,
Which now suits with it.—Whiles I threat, he lives:
Words to the heat of deeds too cold breath gives.

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William Shakespeare (1564 - 1616) England
Source: Macbeth, Act 2, Scene 1