"Our time and space was beautiful, even if it has ended, even if it will never be the same; the universe is a strange place. In the end, I'm just thankful to have shared anything with you, for any time at all." -William C.
The idea of forbidden love is found between Nicholas and Etta. They come from families who are at war, as well as from different time periods. In Nicholas' time a man and a woman of different races was also looked down on.