The central message of the Second Coming and Sailing to Byzantium is that humans are mortal, while art is eternally beautiful. Therefore, art has permanent value.
This is false.The theme is the central message of a literary work.
campaign slogans
It's send in the form of a laser beam - which reflects internally.
it would be the theme
The central message of a literary work is the main theme or idea that the author conveys to the reader. It is the underlying meaning or lesson that the work as a whole aims to communicate. The central message often reflects the author's views on a particular subject or issue and is usually open to interpretation by the reader.
The "theme" is what the author is trying to convey, the central idea or message of the story. Not to be confused with plot, which is what happens in the story or moral, which is the lesson that is learned from the story.
Sailing to new lands might advance Christianity because those sailing can easily carry the good news to the people in the new lands. People who take the gospel message to new lands are normally referred to as missionaries.
The central message of the Sermon on the Mount was to show that happiness depended much an individual's relationship with God. Jesus outlined nine happinesses in the Sermon on the Mount.
CENTRAL
what was the central message (or moral) of the story
main ideal
main ideal