It is the main message or idea the author is trying to convey to the reader. The theme is the author's opinion of the subject.
<span> the ocean, beginning "Roll on, thou deep and dark blue ocean—roll!," Byron contrasts its permanence, power, and freedom with vanished civilizations: "Thy shores are empires, changed in all save thee—/ Assyria, Greece, Rome, Carthage, what are they?" The ocean remains, "Dark-heaving;—boundless, endless, and sublime—/ The image of Eternity...." </span>
For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.
:) Good luck, luv
The index is a list of list of names, subjects, ect. so it would be index