Emotionally mature people have a secure sense of self. They don’t feel threatened when other people see things differently, nor are they afraid of seeming weak if they don’t know something. So when you have an insight to share with them, they listen and consider what you tell them. They may not agree, but thanks to their natural curiosity they’ll try to understand your point of view. John Gottman, well-known for his research into relationships and marital stability, describes this trait as a willingness to be influenced by others, and counts it among his seven principles for a sustainable, happy relationship (1999).