In writing prose how can you make sure that readers have a clear understanding of your meaning

Read the excerpt from "The Gift of the Magi."

And here I have lamely related to you the uneventful chronicle of two foolish children in a flat who most unwisely sacrificed for each other the greatest treasures of their house. But in a last word to the wise of these days let it be said that of all who give gifts these two were the wisest.

The theme expressed in this paragraph is that

do you have a picture of the cartoon?