My dear Macbeth, why do you look so startled and afraid of these nice things they’re saying?
All hail, Macbeth! Hail to you, thane of Glamis!
Act 2: Scene 3
We have come to escort the King.
Ah, Macduff and Lennox, welcome to the castle.
Act 4: Scene 1
Macbeth will never be defeated until Birnam Wood marches to fight you at Dunsinane Hill.
This is one of the first scenes of the play, and in it, the idea of fate and free will is first brought into question. Macbeth is told by the witches that he would become the king over Duncan, although Macbeth previously had no desire to be king. The viewer then brings into question whether or not Macbeth will take up this position. What the witches have said will most likely cause a conflict resulting in a questionable fate.
Lennox and Macduff arrive to escort King Duncan, and enter Macbeth and Lady Macbeth's castle. Upon entering, they ask where the king is, and Macbeth responds saying that he is sleeping. While the audience knows that Macbeth is lying, Lennox and Macduff also take this at face value. Once they check on King Duncan, they find that he is dead, to which Macbeth attempts to hide his suspect by killing the guards who he claims killed Duncan. The theme of fate vs free will is especially prevalent here, as we see one of the first times Macbeth has turned thought into action, rather than just discussing or talking about what he may have to do.
The third apparition of the witches claim that he will be defeated only once Birnam woods marches to fight against him. While MacBeth did not know what this meant, he took little heed to the warning. He kept acting on his ambition, which is another theme which can be found in the story, and let it get the best of him. While Macbeth had the ability to control the outcomes of his life, he believed the fate the witches had told him, and enforced it by his own actions.