The Vedas are a large body of religious texts originating in ancient India. Composed in Vedic Sanskrit, the texts constitute the oldest layer of Sanskrit Literature and the oldest scriptures of Hinduism. Hindus consider the Vedas to be apauruseya, which means "not of a man, superhuman" and "impersonal, authorless The Upanishads are ancient Sanskrit texts of spiritual theaching and ideas of Hinduism. They are the part of the oldest seriptures of Hinduism, the Vedas, that deal with meditation, philosophy, and spiritual knowledge; other parts of the Vedas deal with mantras, benedictions, rituals, ceremonies, and sacrifices. Among the most important literature in the history of Indian religions and culture, the Upanishads played an important role in the development of spiritual ideas in ancient India, marking a transition from Vedic ritualism to new ideas and institutions. Of all Vedic literature, the Upanishads alone are widely known, and their central ideas are at the spiritual core of hinduism.