Shakespeare refers to the Witches as the Weird Sister, which bears connotations of "wired" meaning fate in Old English and therefore associating their speech with prophecy. The witches could represent the three fates from classicla mythology, as the three fates represent the past, present and future. This reflects the three predicitons they give to Macbeth, as they claim to "spin the threads of life". The three witches have differing roles as one spins, one measures, one cuts. This relates to their roles in the future, present and past, respectively. Shakespeare suggests they are in control of events, as they decide on the fates and destinies of men - or perhaps they lead them to their fate.