“It is no accident that, of the early Jesuit scholars who were pioneers in making China's culture known in Europe, those who concerned themselves with the Book of Changes were all later declared to be insane or heretic. Indeed, to the Chinese themselves the study of the I Ching is not to be taken lightly. By an unwritten law, only those advanced in years regard themselves as ready to learn from it. Confucius is said to have been seventy years old when he first took up the Book of Changes.”