Even with his new title and robes of office, Macbeth does not feel entirely at ease: The security of his kingship rests partly on his own children's succession to the crown of Scotland. However, because he has no children of his own, his treacherous act of regicide — the murder of a king — appears pointless and has been committed on behalf of Banquo's promised successors. The soliloquy that Macbeth delivers is filled with the language of contrast. His split with Banquo is emphasized by opposing pronouns: "They hailed him father to a line of kings: / Upon my head they placed a fruitless crown, / And put a barren sceptre in my grip . . . " (60–62).
The line "To make them kings, the seed of Banquo kings!" (70) is almost incredulous, as if Macbeth is trying to convince himself that the Witches could not possibly have spoken the truth. Whereas Banquo still trusts in the fateful prophecy, Macbeth is all too ready to dismiss it. In Act I, Scene 2, the wounded captain reported that Macbeth the warrior-hero was prepared to disdain Fortune. Now Macbeth the murderer goes one step further by literally challenging Fate itself to a tournament (or "list"): "Rather than so, come, fate, into the list / And champion me to the utterance" (71–72). Note that the verb "to champion" here has its original meaning: to fight against, not for.
The entry of the hired murderers is a crucial element in the development of Macbeth's character. His use of others to do his dirty work presents him as politically powerful but morally weak. Long gone are the days when Macbeth would meet his enemy "front to front." Now he must commit murder with the seeming protection of distance — "something [distant] from the palace" (133). Shakespeare also contrasts ironically the murderers' pragmatic reaction to the idea of murder with Macbeth's conscience-stricken one.
