It is a generally accepted standard that editors should attempt to follow, though occasional exceptions may apply. Any substantive edit to this page should reflect consensus. When in doubt, discuss first on the talk page.
Wikipedia is not a mirror of public domain or other primary source material. In Wikipedia articles, quotes of any original texts being discussed should be relevant to the discussion (or illustrative of style) and should be kept to an appropriate length.
If the work is in copyright, then be careful to limit the amount quoted, do not place it on Wikisource, and only link to websites containing it if they have a right to do so. For instance, a band's official site may contain lyrics or videos for one of their songs; these could be linked to, but we must not link to an unauthorized copy of their video on YouTube, or to a site infringing the copyright on their lyrics.