Core Viewpoint - The article discusses the importance of "tolerance" in mental maturity, emphasizing the ability to accept complexity and uncertainty in life experiences, which is crucial for emotional well-being and psychological resilience [5][22]. Group 1: Concept of Tolerance - Tolerance is described as an expanded inner "container" that allows individuals to accept the complexity and uncertainty of situations without rushing to conclusions [5]. - The concept of "fuzzy tolerance" is introduced, which refers to a stable personality trait that ranges from simplistic, black-and-white interpretations to complex, nuanced understandings [5]. Group 2: Common Manifestations of Mental Maturity - **Complexity in Understanding**: Individuals with high tolerance can hold complex social and psychological information without making hasty judgments [6][7]. - **Acceptance of Contradictory Emotions**: Mature individuals can accept seemingly opposing feelings, recognizing that relationships and experiences often contain both positive and negative aspects [10][11]. - **Reduced Automatic Emotional Reactions**: Emotional stability is highlighted as the ability to tolerate negative emotions without resorting to automatic reactions, allowing for constructive emotional processing [12][14]. - **Ability to Endure Uncertainty**: The capacity to tolerate uncertainty is crucial, as many life situations lack clear answers, and those who can accept this ambiguity tend to navigate life with less anxiety [16][17]. - **Perspective on the Present**: Taking a broader view of situations helps individuals detach from immediate emotional responses, allowing for a more comprehensive understanding of their experiences [18][19]. - **Endurance of Negativity**: The ability to accept disappointment and complexity is framed as a vital skill, especially in a world where certainty is increasingly elusive [22][24].