Group 1 - The article emphasizes the inherent selfishness in human nature, suggesting that individuals prioritize their own interests above others, especially in situations involving significant benefits [9][11][12] - It discusses the painful experiences of individuals who have been betrayed by those they trusted, highlighting the lesson that one should not overestimate the power of sincerity in relationships [17][19][21] - The narrative illustrates that accepting the selfish nature of people can lead to a reduction in personal emotional turmoil and disappointment [22] Group 2 - The article points out that people tend to respect strength and power, and those who appear weak or overly accommodating may be taken advantage of [24][34] - It provides an example of an individual who learned to assert herself after being perceived as weak, leading to greater respect from her peers [33] - The text asserts that human nature is inclined to favor the strong, and this understanding can help individuals navigate social dynamics more effectively [36] Group 3 - The article discusses the concept of jealousy, explaining that individuals often feel threatened by the success of their peers, leading to negative feelings and actions [40][48] - It illustrates this point through a character who faces hostility from colleagues due to his capabilities, emphasizing that success can provoke jealousy rather than admiration [42][46] - Understanding this aspect of human nature can help individuals manage their expectations and emotional responses in competitive environments [49] Group 4 - The article highlights the fickle nature of human relationships, where initial promises and affections can quickly fade, leading to feelings of betrayal [51][57] - It shares a narrative about a character whose partner's affections wane after marriage, illustrating the unpredictability of human emotions [53][58] - Accepting the variability in human behavior can lead to a more realistic approach to relationships and reduce unnecessary emotional distress [59][63]