This philosophy makes Hinduism a very tolerant religion, always ready to accept new ideas from other cultures. While it might surprise people how a book can have no beginning or end, the ancient Rishis who wrote these accepted that the complete knowledge of the Universe could never fit in any book, and so there would always be new things to discover. Any form of Knowledge acquired is considered as a Veda whereby it has no beginning or end. The Vedas are the most ancient books in the World, and they are the Foundation of Hinduism. While many historians regard the Vedas as some of the oldest surviving texts in the world, they estimate them to have been written down between 2500 and 500 BCE. Many Hindus believe that the Vedas were not written by anyone including Ishwar (the term used for God among the Hindus), but are eternally existing (apauruseya). They are considered to be one of the integral scriptural foundations of Hinduism.
The Vedas are an extremely large and comprehensive scripture that form the core of Hinduism.