"I have no spur to prick the sides of my intent, but only my vaulting ambition which o'erleaps itself and falls" A1S7
-Shakespeare uses zoomorphism, likening Macbeths ambition to a horse that he cannot control - he detaches himself.
-Verb "o'erleaps" reveals a constant desire for v]more, foreshadowing that ambition will drive Macbeth's downfall
-Spurs are something harmful used to control horses- his ambition remains unchecked, guiding him to regicide
-Structurally this is placed in a significant place: after Macbeth says this, Lady Macbeth enters- is she the spur?