A predicate nominative or predicate noun completes a linking verb and renames the subject. It is a complement or completer because it completes the verb. Predicate nominatives complete only linking verbs. ... Predicate nominatives can be compound. Example: Mr. Johanson is a teacher, father, and my neighbor.
It means life has its ups and downs. Everything is not always great or not always bad. Somehow it all kind of balances out