Ethics in religion concept, it demands careful and sustained reflection by every man and woman before it can become part of one's life. Ethics that constitute a dharmic life - that is a moral, ethical, virtuous life - evolve in vedas and upanishads. Ethical subjects and questions are debated by various schools of Hinduism, quite extensively, in numerous texts on what is right conduct, when, how and why. Over time, new virtues were conceptualized and added by ancient Hindu scholars, some replaced, others merged. For example, Manusamhita initially listed ten virtues necessary for a human being to live a "dharmic" life: "Dhriti" (courage),
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