LADY MACBETH. Glamis thou art and Cawdor and shalt be What thou art promised. Yet do I fear thy nature It is too full o' th' milk of human kindness To catch the nearest way thou wouldst be great Art n?

Lady Macbeth is expressing concern that her husband, Macbeth, is too kind-hearted to seize power. She worries that his compassionate nature will prevent him from taking the necessary ruthless actions to become king. She believes he needs to overcome his "milk of human kindness" to fulfill his ambition.