The theme develop because in the whole story it's basically tell us to listen and follow directions this why we will have a better chance of doing things and a better outcome
A verb is the action that the subject does.
The verb in this sentence is was.
Night (the subject or noun) is doing the action of "being" quiet (the adjective since it describes the night)
Hope this helped!
~Just a girl in love with Shawn Mendes