A thesis statement is found in the first paragraph. It generally has a list of three things, though it can be more, that are the main topics you'll be discussing in your essay.
For example, "Tigers are the best of the big cats because of their loud voices, bright coloring, and social structure."
This sentence shows Algernon's doubts and critics about marriage.
Through this passage we can see that Algernon does not believe that husband and wife can be faithful to each other, and that they always need a third person to keep them satisfied.
