Read it through once

LADY MACBETH. We fail? But screw your courage to the sticking-place, And we’ll not fail. When Duncan is asleep (Whereto the rather shall his day’s hard journey Soundly invite him), his two chamberlains Will I with wine and wassail so convince That memory, the warder of the brain, Shall be a fume, and the receipt of reason A limbeck only: when in swinish sleep Their drenched natures lie as in a death, What cannot you and I perform upon Th’ unguarded Duncan? what not put upon His spongy officers; who shall bear the guilt Of our great quell?