stannisbaratheon:

MACBETH
   If we should fail?

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
   The unguarded Duncan? what not put upon
   His spongy officers, who shall bear the guilt
   Of our great quell?

MACBETH, ACT I.

I dare do all that may become a man;
Who dares do more, is none.