Lady Macbeth reads a letter from Macbeth describing his meeting with the witches and their prophecies. [1] The letter promises Macbeth that he will become Thane of Cawdor and then king, fulfilling the witches' predictions. [2] Lady Macbeth is excited and ambitious, but also fears Macbeth's nature is "too full o' the milk of human kindness" to achieve the throne through violent means. [3] She vows to pour her "spirits" into Macbeth and encourage him to seize the crown, no matter what obstacles stand in their way. [4]