In Act III, Scene 4 of Macbeth, after having seen the "horrible shadow" of Banquo, who reminds Macbeth of the horror of his soul, Macbeth realizes that his path is steeped in blood--"blood will have blood." So, having thus acknowledged that he has committed himself to this murderous operation of maintaining his power by eliminating anyone who threatens it, Macbeth, aware that "Stones have been known to move and trees to speak," predictions have come true, determines to
- go early in the morning to consult with the "weird sisters"
- to act quickly upon the strange things in his mind that need to be worked out before others start to question them
It is apparent that Macbeth's fears are beginning to overcome him. While he feels that his delusions will harden with experience, his behavior and speech suggest that he is beginning to become so mired in his murderous path that he will not find relief, even if he does seek the advice of the preternatural world.