After reading the letter from her husband, Lady Macbeth's thoughts immediately turn to murder. She knows her husband and that he is “too full o' th' milk of human kindness” This imagery is meant to show how she views him as a child who still needs to be nurtured and guided. This highlights the the fact that Lady Macbeth holds power over him, which divulges the dominant figure in the relationship and how it's opposite of the typical male dominant figures in relationships during the Renaissance. The word “milk” also symbolizes what kind of man Macbeth was before everything took place. It shows his purity and how he has a blank slate, just as milk is white. Through this, she realizes that even though Macbeth has ambition, he doesn’t have the nerve