What are the three key ideas of chapter three of The Princess and the Goblin By George MacDonald?

Stephen has just finished composing his first poem, entitled clouded memories, for his poetry slam class. he is slated to recite the first 10 lines during class tonight, and repeats them over and over to himself as he is walking there. this is called

How many stanzas does this poem have, shall i compare thee to a summer day?

What is the reasoning in this argument?