Which principle focuses on "Brotherhood" among practitioners?

The principle that emphasizes "Brotherhood" among practitioners is found in the concept of Taekwondo Mental Education. This idea encompasses not just the physical aspects of martial arts but also addresses the importance of relationships, respect, and camaraderie among practitioners. It promotes the idea that martial artists should support one another, fostering a sense of belonging and mutual respect within the community.

While the Taekwondo Tenets and the USA Taekwondo Code also contain aspects of respect and integrity, they do not specifically highlight the notion of brotherhood in the same way that Mental Education does. International Rules pertain more to regulations and guidelines for competitions rather than the emotional and ethical bonds between practitioners.