The Three Witches chant, “All hail, Macbeth! /  that shalt be king hereafter” (1.3.50).  

Macbeth says, “If chance will have me king, why, chance may crown me, /  Without my stir”  
( 1.3.144-145).  

Macbeth states, “If it were done when ’tis done, then ’twere well/
It were done quickly;  If the assassination/
Could trammel up the consequence, and catch, 
With his surcease,  success; / that but this blow
Might be the be-all and the end-all- here,
But here, upon this bank and shoal of time,
We’d jump the life to come. But in these cases
We still have judgment here; / that we but teach
Bloody instructions, which, being taught, return
To plague th' inventor; / this even-handed justice
Commends the ingredients of our poisoned chalice
To our own lips. / He’s here in double trust:
First, as I am his kinsman and his subject,
Strong both against the deed; /  then, as his host,
Who should against his murderer shut the door,
Not bear the knife myself.  / Besides, this Duncan
Hath borne his faculties so meek, hath been
So clear in his great office, that his virtues
Will plead like angels, trumpet-tongued, against
The deep damnation of his taking-off; / 
And pity, like a naked newborn babe,
Striding the blast, or heaven’s cherubim, horsed
Upon the sightless couriers of the air,
Shall blow the horrid deed in every eye, / 
That tears shall drown the wind.  / I have no spur
To prick the sides of my intent, but only
Vaulting ambition, which o'erleaps itself
And falls on th' other” (1.7. 1-27).   

 Macbeth states to Lady Macbeth, "We will proceed no further in this business. /
He hath honored me of late, and I have bought
Golden opinions from all sorts of people,/ 
Which would be worn now in their newest gloss, / 
Not cast aside so soon"(1.7. 32-35).  

Macbeth states, “But yet I’ll make assurance double sure, / 
And take a bond of fate. / Thou shalt not live, / 
That I may tell pale-hearted fear it lies,
And sleep in spite of thunder" (4.1. 83-85).