Martial Arts do not survive by being kept secret. If we try to “protect” them by keeping them close and teaching only a few it is very easy for it to disappear completely. Someone has a family, is too busy to practice, accident, Illness or maybe injury and suddenly the whole of the generation is gone. I have seen it happen.
Sharing our arts make them stronger through numbers. Finding those students who will carry it forward means being open and sharing our arts with each other and people who learn from us. After all if the art you study has benefited you, why be so selfish as to deny it to someone else?