Tonight good Duncan, friend and guest This dagger shall pass through thy breast I shall be king as was the prophecy and belief Told by the hags upon the heath
Unsexed like them, my Lady chides me still For my kindness and uncertain will Even as my dagger drips once more And blood from noble Banquo stains the floor
Now in blood so far I'm steeped Only can I wade more deep
But this horizon leads no longer to infinity Steadily it closes in on me Slow but marching all the same Toward the hill at Dunsinane
And though those warning words I scorned Not all men are of woman born Thus proves the prophesy no lie Live by the sword and therefore by it die
In theatrical circles the superstition persists that it is very bad luck to mention the title of "the Scottish play". Such is the power of Shakespeare's Macbeth.
References: Act I Scene V (Lady Macbeth to Macbeth) yet do I fear thy nature; It is too full o' the milk of human kindness To catch the nearest way
Act I Scene VI (Lady Macbeth) Come you spirits That tend on mortal thoughts, unsex me here, And fill me from the crown to toe-top full Of direst cruelty!
Act III Scene IV (Macbeth) I am in blood, Stepped so far that should I wade no more, Returning were as tedious as go o'er.
Act IV Scene I (Second Apparition) Be ******, bold, and resolute; laugh to scorn The power of man, for none of woman born Shall harm Macbeth
Act IV Scene I (Third Apparition) Be lion-mettled, proud; and take no care Who chafes, who frets, or where conspirers are: Macbeth shall never vanquish'd be until Great Birnam wood to high Dunsinane hill Shall come against him