A simple gesture of a gentleman, or a mirror of your personality? Psychological studies have analyzed prosocial behaviors. You have surely crossed paths with this type of person: the one who, arms loaded, turns back even to hold the door for you. Or the one who slows down their pace so that an unknown person does not have to force the door. This reflex, so natural for some and so rare for others, would not be a simple question of education or culture, but of a deeply rooted personality trait. One that specialists call agreeableness, and it is, if one can say so, a window into our relationship with the world. The ability to consider the well-being of a stranger before even thinking about our own needs is what researchers refer to as a prosocial behavior. In other words, any voluntary act performed to benefit others, without direct expectation of reciprocity. This behavior has been the subject of analysis by the largest public study ever conducted on kindness: The Kindness Test, piloted by the Sussex Centre for Research on Kindness at the University of Sussex, in partnership with BBC Radio 4. No fewer than 60,000 people, from 144 different countries, responded to a detailed questionnaire on their attitudes and experiences of kindness in daily life. The results, broadcast in March 2022 in the series The Anatomy of Kindness on BBC Radio 4, highlighted a particularly clear link between personality and generosity. The people who were the most generous in their daily lives all had high scores on three specific personality traits: extraversion, openness to experience, and, in the most consistent way, agreeableness. Researcher Claudia Hammond, visiting professor at the University of Sussex, also noted that these individuals demonstrate greater self-confidence to offer their help, better accepting the risk of rejection or indifference from the other party. But what exactly is agreeableness? In the famous Big Five model, the five major dimensions of personality studied by scientific psychology, agreeableness denotes the natural tendency to be cooperative, kind, empathetic, and oriented toward the "we" rather than the "me". This finding is corroborated by another notable study published in the Personality and Social Psychology Bulletin by Meara Habashi and her team at the University of Iowa. In several experiments involving hundreds of participants, the researchers tried to identify which personality trait best predicted the act of helping a stranger in difficulty. Result: while empathy played a role in people who were both agreeable and neurotic, only those with a high agreeableness score actually took action to help the victim. What makes this trait so powerful is that it does not depend on the moment's mood or the social context. This gesture is a moral automatism. A way of being in the world where the other counts, almost without effort.