Act 4, Scene 1

    Macbeth goes to see the witches to see if he can find out more information. The witches unleash three apparitions to tell Macbeth the information he wants to know. The first apparition says to beware of Macduff. The second basically says that he has nothing to worry about because nobody born from a woman could ever harm him and that is seemingly impossible. The third says that he will only be defeated when Birnam Wood matches to fight him at Dunsinane Hill, which is also seemingly impossible.
    Coming from me who knows what happens in the end, these three pieces of "information" now seem to sound more like warnings. If Macbeth would have made it impossible for these things to come his way, maybe things wouldn't have ended for him the way that they did. All though he 100% percent deserved it, you would think he would've thought about it.