Final answer:
The theme of the text is best captured by the notion that 'Lessons can be learned in unexpected ways,' tying together the diverse quotes provided.
Step-by-step explanation:
The sentence that best states the theme of the text is: c) Lessons can be learned in unexpected ways. This option most effectively encapsulates the various quotes from the provided text, embodying the idea that wisdom and knowledge often come from diverse experiences and observations, not just from traditional learning environments. The quotes touch on self-improvement, moral virtue, personal growth, and the importance of reflection—all of which align with the thematic concept of unexpected lessons.