A piano teacher is loved by all his students. One day at a
concert featuring Chopin's music, he is reminded of how
he missed his chance at greatness by not working hard
enough, so he resolves to enforce greater discipline on his
students, even if it makes them hate him. Later in life, one
of his students – who has become a famous musician -
thanks him.
How does the story's structure most clearly affect the author's message?