The metaphor "a wall of separation between Church and State" used by Jefferson in the above quoted letter became a part of the First Amendment jurisprudence of the U.S. Supreme Court. It was first used by Chief Justice Morrison Waite in "Reynolds v. United States" (1878). American historian George Bancroft was consulted by Waite in the "Reynolds" case regarding the views on establishment by the framers of the U.S. constitution. Bancroft advised Waite to consult Jefferson. Waite then discovered the above quoted letter in a library after skimming through the index to Jefferson's collected works according to historian Don Drakeman.