Passage Summary: To be a classic, a book has to show us something important about being human. Also, if a book isn't worth studying seriously, it won't show us those important things.

Reasoning: Literary classics must reveal something significant about the human condition, and only things worthy of serious study can reveal such significant insights.

Analysis: This stimulus provides a chain of conditional requirements. We can diagram it as: Classic -> Significant Insight -> Worthy of Serious Study. In 'Must be True' questions, we are looking for a valid inference that can be drawn from this chain. The most direct inference is that any literary classic is, by necessity, worthy of serious study. You should also be prepared to look for the contrapositive: if a book is not worthy of serious study, it cannot be a literary classic.