Final answer:
Macduff personifies heaven as feeling the sorrow of the Scottish people, emphasizing his determination to protect his country.
Step-by-step explanation:
Macduff means that the new sorrows, or the hardships and tragedies experienced by the people of Scotland, strike heaven as if it feels the pain and resounds with sorrow. Macduff personifies heaven as being affected by the suffering of the Scottish people, emphasizing the deep sadness and grief caused by Macbeth's tyrannical rule. This personification highlights Macduff's determination to protect his country and seek justice for his father's murder.