"No more that thane of Cawdor shall deceive / Our bosom interest: go pronounce his present death, / And with his former title greet Macbeth." What...

The quote represents King Duncan's words when the king
realizes that the Thane of Cawdor has worked in collusion with the Norwegians in order
to help them defeat Duncan. The king strips the thane of his position at once, and, as a
result, Macbeth is promoted for his valiance and loyalty to the
king:

 What he
hath lost noble Macbeth hath
won.

The quote demonstrates
that the king has a very high opinion of Macbeth and values qualities such as valor,
loyalty, and true friendship. He wants to honor those who exhibit such qualities, and we
see him placing his hopes into Macbeth, believing Macbeth is one of his biggest
supporters.

The tragic tone starts to permeate the play
once we realize that Macbeth is ready to abuse the trust which king Duncan has put in
him for the sake of fulling his own evil ambitions. Although he has every reason to
protect the king, Macbeth dares to create disorder by plotting to kill him so that he
can become the king himself. He murders Duncan, but that very action will ultimately
result in Macbeth's own downfall.