A true miracle would, by definition, be a non-natural phenomenon, leading many writers to dismiss them as physically impossible (that is, requiring violation of established laws of physics within their domain of validity) or impossible to confirm by their nature (because all possible physical mechanisms can never be ruled out). The former position is expressed for instance by Thomas Jefferson and the latter by David Hume. Theologians typically say that, with divine providence, God regularly works through nature yet, as a creator, is free to work without, above, or against it as well.