Hindu texts "Śruti" refers to the body of most authoritative, ancient religious texts, believed to be eternal knowledge authored neither by human nor divine agent but transmitted by sages ("rishis"). These comprise the central canon of Hinduism. It includes the four Vedas including its four types of embedded texts - the Samhitas, the Brahmanas, the Aranyakas and the early Upanishads. Of the "Shrutis" (Vedic corpus), the Upanishads alone are widely influential among Hindus, considered scriptures par excellence of Hinduism, and their central ideas have continued to influence its thoughts and traditions. The "Smriti" texts are a specific body of Hindu texts attributed
Vedas "proof-read" by comparing the different recited versions. Forms of recitation included the "" (literally "mesh recitation") in which every two adjacent words in the text were first recited in their original order, then repeated in the reverse order, and finally repeated in the original order. That these methods have been effective, is testified to by the preservation of the most ancient Indian religious text, the "Rigveda", as redacted into a single text during the "Brahmana" period, without any variant readings within that school. The Vedas were likely written down for the first time around 500 BCE. However, all printed editions