In Sri Bhaktisiddhanta Vaibhava, volume 3 – Genuine and False Gaura Bhajana, Page 81, Srila Sarasvati Thakura makes a point that namacarya free from namapradha and namabhasa can give the Holy Name. And further that one should take shelter of a "pure namacarya". How does this apply in today's context within ISKCON, how does one know who is a namacarya to receive the Holy name from or approach for shelter?