Translation of a part of the book The Philosophy of the Upanishads By Paul Davison

The Ophe Nishdeh is one of the most important sources of Indian philosophical-mystical thought, so that almost all schools that consider themselves within the framework of traditional Hindu beliefs, have tried to prove the validity of their views by quoting phrases from these texts. In these texts, which have been considered by many thinkers from all over the world, one can see the most subtle and precise ideas of Hindu jurisprudence. The most important teaching of Ophe Nishdi is to emphasize the unity between Brahman and Atman and to accept that one truth.