When I first went to India to learn more about the mysteries of yoga I was following in the footsteps of the famous Chinese pilgrim-traveller, Huien Tsang, who had journeyed nearly 1500 years before me from China to India and to the University of Nalanda expressly to study yoga, for which it was then famous. But in those days teachers were wiser than now, for the practice of yoga was combined with the study of such scientific and philosophic knowledge as then existed. Consequently all applicants for admission had to face a guardian who appeared at the door of the university and asked them difficult metaphysical questions through a small window. This was done to test the intelligence. Only about twenty percent of the candidates passed this preliminary examination and were permitted to enter. The rest had to return home mortified.
-- Notebooks Category 15: The Orient > Chapter 2: India > # 49