Some Buddhists today whose insight is great wonder why Buddha gave this theory, and why he did not give a reason for it. I was very much interested once in San Francisco where a Buddhist came to see me. He was a well-known preacher of Buddhism in Japan. There was another man present who had read many Buddhist books. I was eagerly waiting to hear what this Buddhist priest had to say, but he did not think it necessary to say anything. In order to make him speak I said I would so much like to know the Buddhist teaching about reincarnation. But the other man, the one who had read many books, said, "Reincarnation is the principal idea in the Buddhist religion; that one is born again and again; and that is what constitutes Karma." But I was eager to hear something from the priest! After the other had finished his explanation, I asked the Buddhist preacher if this was right. And in his simple way of speaking, he said, "What this gentleman has said is his belief." He said no more.