The topic that best relates to the theme developed in this passage is common sense.
What is common sense? "There is nothing more uncommon than common sense." This citation is anonymous and is used in many publications, but it shows that many people feel that common sense does not exist.
Common sense is an abstract term which different people mean differently. In general, common sense is regarded as knowledge that most people should know.
You should know how to post the topics and the passage when you post a question. That is how common sense relates to this passage.