Whittier used "We" and "Thou" as forms of repetition in his song of slaves in the desert.
We: He used we as to show that basically slaves WERE NOT alone in this at all. In a way at that time, every single slave was connected with each other no matter what.
Thou: From what i have seen, Whittier is using "Thou" to refer to God. For example: "We are fools, but Thou art wise"
For the devices, he's using Anaphora for "Thou" and maybe Conduplicatio for "We".
In the book Bud, Not Buddy by Christopher Paul Curtis, there are four main themes. They are the importance of family, hope and perseverance, and the effects of racism.
Aurora was called "Briar Rose" by the good fairies when they raised her in the woods. She stayed in the forest for 17 years until the supposed curse Malificent was broken. However, it had to be done hence she was called the Sleeping Beauty when the curse was fulfilled on her.