A simile is used to compare her voice to a "cool, dark room in summer- peaceful, soothing, quiet". This helps let readers know that she is most likely very nurturing, caring, and a definite "motherly figure"
The relationship between power and freedom is that they are both centered around feeling accomplished and dealing with the privileges of freedom or power and how having one or the other goes to show the socioeconomic status of the person who has it. Freedom and power are interconnected to give one the idea of importance and the effects of believing a cause and how this can result in either power or freedom.
He might have chosen to use a rhyme scheme because couples are supposed to work together, compliment another, and be in sync, similar to a rhyme scheme
