Openness & accountability
Through openness, a relationship grows. Someone who is completely closed remains distant. Someone who is vulnerable invites the other one to be open too.
Of course a lot more plays a role in this, like personality, setting and group. But no doubt that openness is a key to growth. Openness makes space to be vulnerable.
Accountability is the extent to which others can speak to you about your behavior and the extent in which you let yourself spoken to. It’s about taking responsibility and being approachable about it. This also has to do with who you are as a person, and a lot to do with the group you are a part of. In the group of 100 you will be far less approachable than in the small one on one setting. And in this large group you are approached on more general matters, while in the one on one it will be more specific.