Metaphysical poets Flecknoe" and Joseph Addison, in quoting him, singled out the poetry of George Herbert as providing a flagrant example. There is no scholarly consensus regarding which English poets or poems fit within the Metaphysical genre. In his initial use of the term, Johnson quoted just three poets: Abraham Cowley, John Donne, and John Cleveland. Colin Burrow, writing for the "Oxford Dictionary of National Biography", singles out John Donne, George Herbert, Henry Vaughan, Andrew Marvell, and Richard Crashaw as 'central figures', while naming many more, all or part of whose work has been identified as sharing its characteristics. Herbert Grierson’s "Metaphysical
Metaphysical naturalism to David Papineau, contemporary naturalism is a consequence of the build-up of scientific evidence during the twentieth century for the "causal closure of the physical", the doctrine that all physical effects can be accounted for by physical causes. According to Steven Schafersman, president of Texas Citizens for Science, an advocacy group opposing creationism in public schools, the progressive adoption of methodological naturalism—and later of metaphysical naturalism—followed the advances of science and the increase of its explanatory power. These advances also caused the diffusion of positions associated with metaphysical naturalism, such as existentialism. In the context of creation and evolution debates,