Final answer:
Malcolm falsely attributes the vices of boundless greed and lust to himself in Scene 3 of Shakespeare's 'Macbeth' to test Macduff's loyalty before admitting it is a lie.
Step-by-step explanation:
In Scene 3 of William Shakespeare's Macbeth, Malcolm falsely attributes excessive desire for power and other vices to himself as a test of Macduff's loyalty. Specifically, he claims to have overwhelming greed and lust that would make him a tyrannical ruler, more so than Macbeth himself. This is a ploy to ensure that Macduff is not trying to betray him and is truly against Macbeth. Eventually, Malcolm reveals that his self-deprecation was a ruse and that he possesses none of these proclaimed vices.