Group 1 - The core idea of the article emphasizes that maturity is not about becoming complex but about returning to a state of innocence and simplicity [2][12] - It highlights that simple-minded individuals possess the ability to simplify complex problems and maintain a pure heart despite life's challenges [5][8] - The article illustrates examples of individuals who, despite facing difficulties, choose to approach life with a straightforward and optimistic mindset, leading to greater happiness [5][11] Group 2 - The narrative includes anecdotes of people who have navigated life's complexities while retaining their simplicity, showcasing the wisdom in maintaining a pure heart [8][11] - It discusses the concept of "看山理论" (the theory of seeing mountains), which categorizes life experiences into three levels of understanding, ultimately advocating for a clear and simple perspective on life [12] - The article concludes that true maturity involves recognizing the complexities of life while still embracing a simple and genuine approach to living [12]