A. Is it pain you feel or is it guilt?
To be is a form of a future verb. so that means all of these will have "will be" in front of them. For example, "Even if wild animals (will be born) in a zoo, it is still cruel to keep them in a small enclosure."
They are epics. They are long epic poems that speak of events and heroes and what happened. They are not about emotions of the writer but rather try to present a history. This type of narration was used in creating novels where the focus was on events and characters and not on emotions.
C. appreciate what you have rather than yearning for what you don't