How does one truly grow up? I propose three criteria: First, act with agency—making choices for oneself in speech and conduct, and willingly bearing all possible outcomes. Second, maintain boundaries in relationships without falling into emotional symbiosis. Third, assign a 50% confidence level to any proposition until it is personally verified. This third point is exceedingly difficult, as it tests one's equanimity: so long as one possesses personal preferences (narcissism), blind faith and prejudice remain inevitable.