How does Macbeth come to be Thane of Cawdor? Cite lines from Act I of The Tragedy of Macbeth

Question:

In act I, scene III, of Macbeth, the witches address Macbeth as Thane of Glamis. When they foretell that Macbeth will become Thane of Cawdor and king, he is bewildered. Soon after, a soldier informs him that Macbeth is now the Thane of Cawdor. Macbeth wonders to himself whether all the prophecies will come true.

Which lines in the excerpt show that Macbeth is on the verge of giving in to temptation, knowing very well that he is considering committing a terrible crime?

MACBETH:

(Aside.)

Two truths are told,

As happy prologues to the swelling act

Of the imperial theme. I thank you, gentlemen.

(Aside.)

This supernatural soliciting

Cannot be ill; cannot be good:—if ill,

Why hath it given me earnest of success,

Commencing in a truth? I am Thane of Cawdor:

If good, why do I yield to that suggestion

Whose horrid image doth unfix my hair,

And make my seated heart knock at my ribs,

Against the use of nature? Present fears

Are less than horrible imaginings:

My thought, whose murder yet is but fantastical,

Shakes so my single state of man, that function

Is smother'd in surmise; and nothing is

But what is not.

If good, why do I yield to that suggestion

Whose horrid image doth unfix my hair,

And make my seated heart knock at my ribs,

Against the use of nature? Present fears

Explanation:

In photo below

the answer is irony!

i believe it may be the hope this sorry if i'm wrong.