And why? Because of the senses, the eyes, the ears, all the senses by which man perceives. The animal also has ears, but he cannot understand the language that he hears. The animal has eyes, but it cannot understand what it sees. In those times there were few who could read and write. The Prophets themselves could not read and write. They had not diplomas from universities. For that knowledge no study is needed. It is always open. Therefore the philosophers were obliged to express their meaning by art, by engraving pictures upon the stone. The greater part of the Buddhistic philosophy has been lost. The four most important books of Buddha were stolen and have never been recovered. The religion remains, with all its beauty. But that from which it had come cannot now be known.