Authors often include multiple themes in a literary work. What theme might be suggested by the evidence in these lines?

In my copy of the text, the following sentences make up lines ten and eleven. Please check to see if we are working with the same text. If not, I will need you to add the text below.

However hard he threw himself onto his right, he always rolled back to where he was. He must have tried it a hundred times, shut his eyes so that he wouldn't have to look at the floundering legs, and only stopped when he began to feel a mild, dull pain there that he had never felt before.